马达加斯加菊石化石 Ammonite fossil from Madagascar (© ThomasLENNE/Shutterstock)

大自然的秘密代码 Nature's secret code

斐波那契日

仔细观察这块菊石化石。它那优雅盘旋的螺壳，曾是史前海洋生物的家，如今却蕴藏着一个数学的秘密：螺旋结构。每一个新的壳室都比前一个按比例增大，保持着恒定的生长比，这种规律常被认为与斐波那契数列密切相关。

每年的11月23日，人们都会庆祝斐波那契日，以纪念这位13世纪的意大利数学家。然而，这一数列的最早记载可追溯至公元前200年，由古印度诗人兼数学家品迦拉首次提出。他描述了这样的序列：1、1、2、3、5、8……每个数字都是前两个数字之和。斐波那契数列广泛存在于自然界之中，从菠萝、洋蓟、松果到植物茎上的排序，都能看到它的影子。

菊石是一类生活在距今约4亿年至6600万年前的软体动物，它们在远古海洋中滑行，螺旋壳保护柔软的身体。死亡后，壳体被沉积物掩埋，矿物质在漫长岁月中渗入其中，将这份自然的几何美永久定格。如今，菊石化石静静提醒着我们：数学与自然，其实说着同一种语言。

Fibonacci Day

Look closely at this ammonite fossil. Its swirling shell, once home to a prehistoric sea creature, holds a mathematical secret—a spiral pattern. Each new chamber is proportionally larger than the previous one, maintaining a consistent growth ratio, often associated with the Fibonacci sequence.

Each November 23, we celebrate Fibonacci Day, named after the 13th-century Italian mathematician Leonardo Bonacci (Fibonacci), who introduced the concept to Europe. The pattern 1, 1, 2, 3, 5, 8…—where each number is the sum of the two before it—was, however, first described in India as early as 200 BCE by the ancient poet-mathematician Pingala. The Fibonacci sequence appears widely in nature, including pineapples, artichokes, pinecones, and the arrangement of leaves on a stem.

Ammonites were mollusks that lived between 400 and 66 million years ago, gliding through ancient seas inside coiled shells that protected their soft bodies. When ammonites perished, sediment buried their shells, and minerals slowly turned them to stone, preserving this natural geometry for millions of years. Today, the ammonite fossil is a striking reminder that math and nature speak the same language.

乐山大佛, 四川, 中国 Leshan Giant Buddha, Sichuan, China (© www.anotherdayattheoffice.org/Getty Images)

守护江河的佛像 The guardian of the waters

乐山大佛, 四川, 中国

世上有许多巨像，但没有一座能与乐山大佛相比。它坐落于中国四川省岷江、青衣江与大渡河三江汇流处的峭壁之上，是古代工程学的奇迹。建造始于公元713年，由一位名叫海通的僧人发起，他希望佛像的存在能平息险恶的水流，庇护来往的船只。据传，当工程因资金短缺而停滞时，海通为表诚心，甚至挖去了自己的双眼。整项工程历时约90年，直至他去世多年后才告完工。这尊佛像高达71米，是世界上最大的石刻佛像。其双肩宽约28米，耳长近7米，每只脚掌的长度超过8.5米。佛像内部设有隐蔽的排水系统，能有效防止雨水侵蚀，也因此得以在 1200多年的岁月里屹立不倒。

1996年，乐山大佛与峨眉山风景区一同被列入联合国教科文组织世界遗产名录。尽管岁月、风雨与污染在其身上留下了痕迹，但持续的修复与保护工作，使这尊巍然大佛依然庄严矗立，成为中国最珍贵的文化地标之一。静静守望着滔滔江水，见证信仰与时光的流转。

Leshan Giant Buddha, Sichuan, China

There are big statues—and then there's the Leshan Giant Buddha. Carved into a riverside cliff at the confluence of the Min, Qingyi, and Dadu Rivers in Sichuan, China, this statue is an ancient engineering marvel. Construction began in 713 CE under a monk named Hai Tong, who hoped that the Buddha's presence would calm dangerous river currents that threatened passing boats. He was so devoted that when funding ran out, he reportedly gouged out his own eyes to prove his sincerity. Construction took roughly 90 years and was completed long after Hai Tong's death. At 233 feet tall, it is the largest stone Buddha in the world. Its shoulders stretch about 92 feet wide, its ears measure nearly 23 feet long, and each foot extends over 28 feet. Drainage channels built inside the statue protect it from erosion, helping explain its remarkable preservation for more than 12 centuries.

Together with the Mount Emei Scenic Area, the Leshan Giant Buddha became a UNESCO World Heritage Site in 1996. Although time, weather, and pollution have taken their toll, continuous conservation work ensures it remains one of China's most treasured cultural landmarks.

查帕达迪亚曼蒂纳国家公园，巴伊亚州，巴西 (© Marcio Dufranc/Getty Images)

颂扬保护与美

查帕达迪亚曼蒂纳国家公园，巴伊亚州

查帕达迪亚曼蒂纳国家公园拥有宛如梦境般的自然美景，该公园创建于1985年，今年迎来了其40周年的保护纪念日。这座位于巴伊亚州腹地的公园，拥有约15.2万公顷的壮丽景观，是巴西最令人惊叹的生态旅游目的地之一。

这座公园以瀑布、洞穴、峡谷和巍峨山脉闻名。其中最引人注目的当属高达340米的烟雾瀑布——这是巴西最高的瀑布之一。每逢风起时，奇妙的现象便会出现：飞溅的水花被卷向空中，形成震撼人心的视觉奇观。另一处必游之地是帕伊伊纳西奥山，这里以全景视野和令人难忘的日落而闻名。

除拥有葱郁的自然景观外，该地区还蕴含着与19世纪钻石开采热潮密切相关的丰富历史，正是这一历史背景赋予了其“查帕达迪亚曼蒂纳”之名。以伦索伊斯为代表的村落，凭借其保存完好的殖民时期建筑、多元而富有活力的文化传统以及巴伊亚地区特有的热情待客之道，吸引了众多访客。作为一处兼具生态价值与文化意义的重要保护区，该国家公园不仅是徒步旅行者、探险爱好者及自然研究者的理想目的地，更是一处值得珍视与保护的国家级文化遗产。

匈牙利国会大厦，布达佩斯，匈牙利 Hungarian Parliament Building, Budapest, Hungary (© Alexander Spatari/Getty Images)

石头与符号，诉说一个民族的故事 Stone, symbol, and a nation's story

匈牙利国会大厦，布达佩斯，匈牙利

走近一点，细节便开始诉说——每一块石头、每一座尖塔、每一尊雕像都仿佛藏着自己的故事。匈牙利议会大厦诞生于19世纪末，设计初衷是展现国家的雄心，将哥特复兴的典雅与独具匈牙利特色的元素巧妙融合。建筑师伊姆雷·施泰因德尔的构想历经二十余年，由逾千名工匠共同完成。中央穹顶高达315英尺（约96米），寓意1896年匈牙利建国千年纪念。整座建筑于1904年竣工，至今仍以恢宏之姿矗立在布达佩斯天际线，成为匈牙利力量的象征。

步入其中，华美更显深邃。金箔在楼梯间与大厅间流转生辉，统治者与民族英雄的雕像沿走廊矗立，将历史化作一场视觉盛宴。除了政治职能，议会大厦更是文化象征——这里举办国家典礼，每年迎接数百万游客，并被列入联合国教科文组织世界遗产名录。它不仅是一座地标，更通过那些最初激发设计灵感的细节，持续讲述着匈牙利的故事。

Hungarian Parliament Building, Budapest, Hungary

Step closer, and the details begin to speak—every stone, spire, and statue seems to hold a story of its own. Conceived in the late 19th century, the Hungarian Parliament Building was designed to reflect a nation's ambition, blending Gothic Revival elegance with distinctly Hungarian motifs. Architect Imre Steindl's vision took shape over two decades through the work of more than 1,000 craftsmen. Even the central dome, rising 315 feet (96 meters) high, carries meaning: the height honors the year of Hungary's millennium anniversary in 1896. Completed in 1904, the building still dominates Budapest's skyline as a powerful national symbol.

Step inside, and the richness deepens. Gold leaf shimmers across staircases and halls, while statues of rulers and national figures line the corridors, turning history into spectacle. Beyond its political role, the Parliament has become a cultural emblem—hosting state ceremonies, welcoming millions of visitors annually, and earning UNESCO World Heritage status. More than a landmark, it continues to tell Hungary's story through the details that first inspired its creation.

谢南多厄国家公园的秋色，弗吉尼亚州，美国 Fall colors in Shenandoah National Park, Virginia, USA (© Michael Ver Sprill/Getty Images)

小径在召唤 The trails' call

谢南多厄国家公园，弗吉尼亚州，美国

谢南多厄国家公园，弗吉尼亚州的山间瑰宝。蓝岭山脉在此披上最华美的盛装：金黄的山核桃树、绯红的枫树，以及镀上青铜色的橡树。十一月的空气愈发清冽，秋日的余晖低声细语，悄悄停留在山坡上。沿着天际线公路缓缓前行，105英里的蜿蜒公路带你俯瞰云海翻涌，云影在山谷间轻轻流动，像思绪在天空漂移。这里还有超过500 英里的步道，沿着小径，你会走进瀑布奔流的深谷，登上触碰天际的高峰。石人峰、鹰嘴峰、暗谷瀑布——每处皆是石与叶谱写的诗篇，静待游人的脚步与风声共鸣。

National Take a Hike Day

National Take a Hike Day is more than a date—it's an invitation to step away from screens and into the rhythm of nature. Created by the American Hiking Society, this day celebrates the simple act of walking under open skies and reminds us that health and happiness often begin with a single stride. Across 60,000 miles of US trails, hikers rediscover the quiet magic of forests, the strength in their own breath, and the promise of unspoiled landscapes.

And then there's Shenandoah National Park, Virginia's mountain jewel. Here, the Blue Ridge Mountains wear their finest colors—golden hickories, crimson maples, and oaks brushed in bronze. By November, the air turns crisp, and the last embers of fall cling to the hillsides like whispered secrets. Skyline Drive winds for 105 miles, offering vistas where clouds drift like thoughts across endless valleys. Trails—more than 500 miles of them—lead to places where waterfalls tumble and summits greet the horizon. Stony Man, Hawksbill, Dark Hollow Falls—each a poem written in stone and leaf, waiting for footsteps to rhyme with the wind.

里昂的一条穿廊，法国 A traboule in Lyon, France (© TPopova/Getty Images)

承载过往的篇章 Passages with a past

里昂的一条穿廊，法国

在法国里昂，你不只是简单地走过街巷，而是像在城市的脉络中轻盈滑行。这里的穿廊，是一条条隐秘的通道，蜿蜒穿梭于庭院与建筑之间，将简单的散步变成一场寻宝之旅。它们曾是最早的捷径，帮助居民避雨、搬运货物，或悄然穿过中世纪街区。如今，这些通道更多承载的是探索的乐趣。它们的历史可追溯至公元四世纪，在文艺复兴时期更显重要——当时丝绸商人利用这些通道，将珍贵织物从作坊安全运送到河边，免受风雨侵扰。二战期间，抵抗运动战士也曾借助这些通道作为秘密逃生路线。走进里昂，你会发现，每一条穿廊都藏着故事，每一次转角都可能遇见历史的回声。

A traboule in Lyon, France

In Lyon, France, you don't just walk through the city—you glide through it. The traboules, a network of hidden passageways threading between courtyards and buildings, turn a simple stroll into a treasure hunt. They were the original shortcuts, allowing residents to dodge rain, carry goods, or move discreetly through the medieval quarters. Today, they're less about practicality and more about discovery. These passages date back to the fourth century but became essential during the Renaissance, when silk traders used them to shuttle delicate fabrics safely from workshops to the river without braving the weather. Later, during World War II, Resistance fighters used the traboules as escape routes.

Most of Lyon's traboules are tucked away in the Vieux Lyon and Croix-Rousse districts. Push open what looks like an ordinary wooden door, and you might step into a courtyard with spiral staircases, arched galleries, and stone corridors that snake between buildings. Some passages are public, some private, and all of them blur the line between indoors and outdoors. Walking a traboule is like flipping through the city's footnotes. You're right in the heart of a living neighborhood, yet moving through centuries of history.

秋天的伊吕波坂，日光市，栃木县，日本 Irohazaka Road in fall, Nikko, Tochigi, Japan (© oneinchpunch/Shutterstock)

像日光那样“弯道飞驰” Bend it like Nikko

秋天的伊吕波坂，日光市，栃木县，日本

秋天是伊吕波坂最耀眼的季节，正如今日画面所示。从10月下旬到11月上旬，枫叶的红、银杏的金、落叶松的黄层层叠叠，铺满山坡。蜿蜒的道路一路通向日光的著名景点：攀登至顶，便可抵达赤地平原。这里有缆车可俯瞰中禅寺湖和气势磅礴的华严瀑布。山顶的中禅寺湖静谧如镜，与盘旋的山路形成鲜明对比，而瀑布在下方轰鸣奔泻。几个世纪前，朝圣者沿着这条路前往神社与寺院，如今旅行者依旧踏上同样的路径，只是相机快门声取代了虔诚的诵经声。

Irohazaka Road in fall, Nikko, Tochigi, Japan

If you think the alphabet is straightforward, Japan's Irohazaka Road in Nikko will twist that belief right out of you. Named after the old Japanese syllabary 'Iroha,' this mountain pass once had 48 hairpin bends—each curve matched to a character of the alphabet. Today, it's a pair of separate one-way roads—one goes up, the other comes down, and both make drivers feel as if they're spelling out a story with every turn.

Fall is when Irohazaka truly shows off, as captured in today's image. From late October to early November, maple reds, ginkgo golds, and larch yellows spill down the slopes. The winding route also leads to some of Nikko's greatest hits. Climb up, and you'll reach the Akechidaira Plateau. Here, a ropeway gives you sweeping views of Lake Chuzenji and the powerful Kegon Falls. At the top, Lake Chuzenji offers a calm contrast to the dizzying drive, while the waterfall roars below. Centuries ago, pilgrims took this same route to reach sacred shrines and temples. Today, travelers follow in their tracks, though probably with more camera clicks than chants.

夜晚的箭袋树与银河，基特曼斯胡普，纳米比亚 Quiver trees under the Milky Way, Keetmanshoop, Namibia (© Wim van den Heever/naturepl.com)

星光下的颤动之树 Quivering under starlight

箭袋树，基特曼斯胡普，纳米比亚

在地球上所有的植物中，箭袋树或许最像来自未来的生命。它们分布于非洲南部，尤其是纳米比亚的干旱地区。虽然名字里有“树”，但它其实是一种芦荟属植物，经过漫长岁月的适应，能在炙热的沙漠中顽强生存。厚实的树干储存水分，分枝则能反射热量，帮助它抵御极端环境。箭袋树可高达7米，有的寿命超过百年，是沙漠生态系统中不可或缺的一环。在几乎没有其他树木的荒原上，它为鸟类提供了珍贵的栖息与筑巢之所。

“箭袋”这一名称正源于当地桑人的古老习俗，他们曾将树枝挖空制作箭袋。位于基特曼斯胡普附近的箭袋树森林如今被列为纳米比亚国家纪念地，也是该国最受摄影师喜爱的景点之一。这片沙漠拥有地球上最清澈的夜空，是观星的绝佳之地。在今日图片中，箭袋树的轮廓映衬在银河之下，仿佛在星光中轻轻颤动。尽管气候变化正在改变它们的自然分布范围，这些树依然是纳米比亚粗犷之美的象征，提醒着我们，大自然总能以最富想象力的方式适应与延续。

Quiver trees, Keetmanshoop, Namibia

Of all the plants on Earth, the quiver tree looks the most like a vision from the future. Found in Southern Africa, including parts of Namibia, these striking giants are not true trees but a species of aloe adapted to life under the desert's scorching sun. Their thick trunks store water, while their branches reflect heat, helping them endure harsh conditions. Reaching up to 23 feet in height, with some living for more than 100 years, quiver trees are also vital to their ecosystem. They offer rare perches and nesting sites for birds in landscapes where few other trees exist.

The name 'quiver' comes from the Indigenous San people, who once hollowed out the branches to craft lightweight arrow holders, or quivers. The Quiver Tree Forest near Keetmanshoop is a national monument and one of Namibia's most photographed sites. With some of the clearest skies on Earth, the desert provides a perfect backdrop for stargazing. In today's image, quiver trees stand silhouetted against the Milky Way. Though climate shifts are altering their natural range, these trees remain a symbol of Namibia's rugged beauty—and a reminder of how nature adapts in the most imaginative ways.

斗兽场鸟瞰图，罗马，意大利 Aerial view of the Colosseum, Rome, Italy (© Nico De Pasquale Photography/Getty Images)

条条大路通罗马 All roads lead to Rome

斗兽场，罗马，意大利

觉得现代体育赛事已经足够精彩了吗？在古罗马时代，观众们坐在斗兽场中目睹的表演要激烈得多。这座宏伟的圆形露天竞技场由罗马皇帝韦斯帕先于公元72年下令建造，其子提图斯于公元80年完工。与早期依山而建、借助地形支撑的剧场不同，罗马斗兽场完全独立矗立，是一座自成体系的建筑奇迹。斗兽场由石块与混凝土建成，拱门与穹顶结构支撑着可容纳多达5万名观众的竞技场。角斗士的搏斗、异国野兽的展示，甚至模拟海战，都令观众热血沸腾地下的升降机与暗门让场景转换瞬息万变，充满戏剧张力。

进入中世纪后，斗兽场被赋予了新的用途：曾一度被改作教堂，后来又成为堡垒。几个世纪以来，它经受了雷击、地震与污染的破坏。建筑中大量的石灰华与大理石被重新利用，修建宫殿、防御工事，甚至教堂。这种做法被称为“拆卸再利用”， 它让斗兽场的碎片真正融入了罗马这座不断演变的城市。直到19世纪，人们才开始对其进行系统的保护。如今，罗马斗兽场作为受保护的世界文化遗产，每年吸引近 700 万名游客，依然是意大利最具象征意义的地标之一，见证着古罗马的荣耀与永恒。

Colosseum, Rome, Italy

Think modern sports are dramatic? Ancient Romans had front-row seats to spectacles far more intense inside the Colosseum. Commissioned by the Flavian emperor Vespasian in 72 CE and finished by his son Titus in 80 CE, this amphitheater broke tradition with its predecessors that were built into hillsides for natural support. Instead, the Colosseum was a fully free-standing architectural giant. Crafted from stone and concrete, its arches and vaults supported an arena that could host up to 50,000 spectators. Gladiators, exotic animals, and even staged sea battles thrilled the crowds, while hidden elevators and trapdoors created sudden, dramatic appearances.

During the Middle Ages, the Colosseum found new purposes: first as a church, later as a fortress. Over the centuries, it endured damage from lightning strikes, earthquakes, and pollution. Much of its marble and travertine was also reused in palaces, fortifications, and even churches—a practice known as 'spolia,' which quite literally wove pieces of the structure into the evolving city of Rome. It wasn't until the 19th century that serious preservation began. Today, recognized as a protected monument and welcoming nearly 7 million visitors annually, the Colosseum remains one of Italy's most iconic landmarks.

条顿堡森林的伊克斯坦岩石层，德国 The Externsteine rock formation in the Teutoburg Forest, Germany (© Michael Sroka/Getty Images)

传奇之地 Where legends rise

条顿堡森林的伊克斯坦岩石层，德国

在德国北莱茵-威斯特法伦州的霍恩-巴特迈因贝格附近，条顿堡森林的腹地矗立着壮丽的埃克斯特恩岩石群。这些砂岩石柱形成于约7,000万年前，是德国最重要的自然与文化地标之一。高达35米的岩柱以其独特的形态与深厚的历史底蕴吸引着无数游客。早在中世纪，这里就被用作宗教祭祀之地，这一点从12世纪刻在岩石上的下十字架像浮雕中可见一斑，这是阿尔卑斯山以北最古老的此类浮雕。

如今，游客可以沿着石阶与步道攀登至岩石顶端，在那里俯瞰条顿堡森林的壮丽全景。无论被视为充满神秘能量的圣地、令人叹为观止的纪念碑，还是条顿堡森林与埃格山自然公园中一个多样的景点，埃克斯特恩岩石群都能为游客带来难忘的体验。这里设有标识清晰的登山路线、信息中心，以及诸如自然体验中心和鸟类公园等周边景点。无论春夏秋冬，埃克斯特恩岩石群都以独特的姿态诉说着岁月的传奇，成为一处真正跨越时间的奇景。