This astonishingly geometric cave has inspired everyone from Jules Verne to Pink Floyd.

One man's extraordinary topiary garden in a small South Carolina town.

Nestled in an unassuming residential area, this "forbidden forest" is rumored to spirit away those who dare to enter.

148 feet long and in the middle of a verdant forest.

The sound of swaying stalks in this stunning grove has been named a governmentally recognized sound.

This jaw-dropping 19th-century bridge uses its reflection to form what appears to be a perfect circle.

This 170-year-old Swiss guesthouse built into the side of a mountain is best accessed by a cable car.

The hidden "ballroom" under a mansion lake was built by a criminal who ate a cyanide pill during his trial.

The only Bahá'í house of worship in North America and one of only a handful worldwide.

Possibly the oldest of Britain's ancient henges is also one of its most stark.

The 5,000-year-old megalith is believed to be Scotland's tallest standing stone.

The true age of this ancient stone circle is unknown, but its stunning vista isn't in question.

On a remote island, legend has it that a fiddler and his wife were turned to stone.

The largest freshwater lake in northeast India is also the only floating national park in the world.

This eye-popping Icelandic crater lake is surrounded by red volcanic rock.

The mysterious, fantastical woodland inspiration for "The Lord of the Rings."

The city of Rockford, Illinois is symbolically protected by a quartet of fittingly stony sentinels.

This mysterious medieval grotto holds a grid of sacred wells of unknown purpose.

The easternmost town in Alaska can only be accessed from Canada.

The ruins of this medieval castle on a foggy hill tell the story of a once-mighty empire.

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

The remains of a magnificent medieval fortress that was the capital of a vast empire.

Eyam took steps to quarantine themselves and keep the plague from spreading.

A tunnel with windows, so you don't miss out on the impressive views.