From the greystone of Montreal to the limestone of Jerusalem, every city has its own iconic identity read through the city’s urban fabric. Scanning the architecture of the 1,110-year-old German town of Nördlingen, the timber frame homes, red pitched roofs, and winding streets appear identical in almost every regard to many quaint medieval communities populating the European countryside.

While the town’s appearance in the 1971 classic “Willy Wonka and the Chocolate Factory” may seem like its most notable claim, there is something entirely unique about the architecture of this south German locale. Nördlingen is literally made of diamonds — millions of microscopic diamonds to be exact — with the town itself constructed within an ancient impact crater.

The 25 kilometer-wide Reis crater in which the town sits was formed approximately 15 million years ago after an asteroid collided with this region of Bavaria. In addition to leaving the indentation where the town was built, molten rock was tossed into the air from the immense pressure of the impact causing the existing rock to form diamonds. This collision also resulted in the creation of a coarse-grained rock containing crystal, glass, and diamond known as suevite.

Around 900 A.D., the first settlements began in the area though it was not until the Middle Ages that the fortified walls surrounding the town were constructed. Gathering the nearest available material, masons quarried the local suevite. For centuries, the citizens of Nördlingen had believed the depression housing the town to be a volcanic crater unaware of the gemstones embedded in very fabric of their community.

While unknowingly constructed inside the crater, geologist Eugene Shoemaker finally confirmed the site was the result of an asteroid in the 1960s and by the 1970s, scientists had analyzed the surrounding rocks to discover that they held more that 72,000 tons of diamond. The Church of St. Georgs, the tallest structure in the town, is constructed entirely of suevite and contains approximately 5,000 carats of diamond. However, the largest gemstones are 0.3 mm and can only be observed with a microscope. Yet the diamond-clad stone structures are said to catch the sunlight, rendering the buildings in a soft glimmer.

Today, the sleepy Bavarian town of over 19,000 people houses the RiesKrater Museum, Bavarian Railway Museum, and guided tours of its sparkling architecture. The city’s iconic suevite fabric continues to draw tourists from all over the world as well as researchers from NASA and the European Space Agency.

“It’s quite unique,” said Dr Stefan Hölzl, geologist and director of the RiesKrater Museum. Housed in a 16th-Century barn, the museum educates visitors on how the asteroid impact shaped the town’s future. Throughout its six rooms, display cases are filled with pieces of meteorite and, of course, suevite.

“You have some places in the world where this sort of asteroid impact material has been used for buildings, but nowhere near this amount,” Hölzl said. “Here it was used to build the whole town.”

从蒙特利尔的灰岩到耶路撒冷的石灰岩，每座城市都有自己标志性的身份，而这种身份往往能从城市肌理中读出来。扫描这座已有1110年历史的德国小镇诺德林根，木框架房屋、红色坡屋顶和蜿蜒街道，几乎与欧洲乡村众多古雅的中世纪社区别无二致。

虽然这座小镇曾出现在1971年经典电影《欢乐糖果屋》中，这或许看似是它最引人注目的标签，但这座德国南部小镇的建筑却独一无二。诺德林根实际上是由钻石建成的。确切地说，是数百万颗微小钻石, 因为其坐落于一个古老的撞击坑内。

小镇所在的里斯撞击坑宽约25公里，形成于约1500万年前，当时一颗小行星撞击了巴伐利亚这一地区。撞击除了留下小镇所在的地形凹陷外，巨大压力还将熔融岩石抛向空中，使原有岩石形成钻石。这次碰撞还产生了一种名为苏维石的粗粒岩石，其中含有晶体、玻璃和钻石。

约公元900年，该地区开始出现最早的定居点，但直到中世纪，环绕小镇的防御城墙才得以修建。石匠们采集最近可用的材料，开采当地苏维石。几个世纪以来，诺德林根居民一直认为小镇所在的凹陷是一个火山口，并不知道他们社区肌理中嵌着宝石。

尽管小镇在不知情的情况下建在撞击坑内，地质学家尤金·舒梅克最终在20世纪60年代确认，该地点是小行星撞击的结果。到20世纪70年代，科学家分析周围岩石后发现，其中含有超过7.2万吨钻石。小镇最高的建筑圣格奥尔格教堂完全由苏维石建造，含有约5000克拉钻石。不过，最大的宝石也只有0.3毫米，只能用显微镜观察。但据说，这些镶钻的石质建筑能捕捉阳光，使建筑散发柔和微光。

如今，这座宁静的巴伐利亚小镇有超过1.9万人口，拥有里斯撞击坑博物馆、巴伐利亚铁路博物馆，并提供观赏其闪耀建筑的导览游。小镇标志性的苏维石肌理持续吸引着世界各地游客，以及来自美国宇航局和欧洲空间局的研究人员。

“这非常独特，”地质学家、里斯撞击坑博物馆馆长斯特凡·赫尔茨尔博士说。博物馆坐落于一座16世纪谷仓内，向游客介绍小行星撞击如何塑造了小镇的未来。在六个展厅中，陈列柜里摆满了陨石碎片，当然还有苏维石。

“世界上有些地方也会用这种小行星撞击材料来建房，但用量远不及这里，”赫尔茨尔说，“在这里，它被用来建造了整座小镇。”

(Translated by DeepSeek)