This jagged colossus of a building is mostly held together by an enormous concrete exoskeleton.

Houses are tucked between, on, and underneath giant boulders.

"the sweltering inhabitants of Charleston and New Orleans, of Madras and Bombay and Calcutta, drink at my well . . . The pure Walden water is mingled with the sacred water of the Ganges."

Castle and secret tunnel withstood a siege until its owner was killed by the Holy Roman Empire, while sitting on the toilet.

19th century pendulum and a clock restored by a rogue group of guerilla artists.

A series of caves, tunnels, and wells filled with fascinating figures and symbols.

A hidden slot canyon in the southern Nevada desert makes an unexpected oasis and scenic hike.

Internet rumors, often involving Icelandic singer Bjork, have abounded regarding this isolated outcrop of rock.

A 2017 crowdfunding campaign saved this historic castle from being destroyed.

One man's ambition created this psychedelic log home.

A futuristic-looking beach house built for the owner of a snack food brand.

Colin Stokes "got a bit carried away" and built a castle that looks like something out of Tolkien.

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

This ancient sword lay in a waterlogged tomb for 2,500 years, but managed to remain relatively untarnished and impressively sharp.

This floating garden in the sky is straight out of a fairy tale, but the real thing is nothing short of magical.

Enormous sandstone towers loom within a Czech forest.

Gladiators battle and chariots race daily in the ruins of a once-great Roman city.

Mosaics, storks, and brothels—this ancient city has it all.

The land is full of geologic eye candy, such as otherworldly spires, mushroom-shaped hoodoos, and prehistoric fossils.