This influential Renaissance-era library was once the haunt of kings and monks.

The first geometric self-supporting spiral stairs in Britain are a truly beautiful sight.

Centuries-old bridges grown from tangled roots.

This abandoned bridge to nowhere stands secluded in the woods of a Cleveland suburb.

This medieval "painted village" is famous for its geometric facades.

This museum is a full-size replica of an original church constructed during the 13th-century.

Victorian-era Egyptomania left its mark on this Nashville landmark.

This award-winning men's bathroom was just too beautiful to not allow women to see.

A gorgeous gilded tower houses what may be the world's largest collection of gin.

This massive stained-glass masterpiece is thought to be the largest Tiffany dome in existence.

A 19th-century mansion houses the largest collection of gin in the European Union.

Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.

This massive Brazilian church is built like an angular, technicolor pyramid left by Mayans from the future.

The oldest residential street in Europe also features an optical illusion.

An engineering error ensured this cavernous 350-foot-long subterranean thoroughfare was never used as intended.

Rainbow-hued in the summer and crystalline in the winter, this salty lake has inspired battles, temples, and plenty of awe.

A chain of 16 wondrous lakes formed as a result of the gradual dissolution of soluble layers of bedrock.

A collision of human error and natural geothermal pressure created this rainbow-colored geologic wonder.