This 600-year-old home seems to defy physics.

World's smallest skyscraper, the product of a remarkable con.

This historic stone bridge has an entire neighborhood clinging to its sides.

According to legend, this boat-shaped henge is built over the grave of a mythic king.

This miniature feudal castle was built on a whim to honor a US Navy pioneer.

This huge pile of volcanic boulders hides a stunning network of secret grottoes.

One of the world's southernmost bars.

This iconic science fiction house still looks like something from the future.

These lovely Turkish-styled baths were brought back to life after winning a reality show competition.

While not Turkey's deepest underground city, this subterranean redoubt is the largest.

A sulfuric hellscape in southern Italy.

It's always summer at the beach inside this former airship hangar.

This Connecticut chapel is a starkly modern, and surprisingly colorful, architectural rebel.

One man and his wife have turned a barren Korean island into a fantastical botanical wonderland.

One man's love of sea life and art has turned his home into a temple of outsider island art.

An out-of-place slice of France, smack in the middle of Shanghai.

Willy Wonka would love this weird half-a-home.

An Albanian monument to the Communism that nearly crushed the country is now a crumbling wreck.

This massive steel pyramid can be entered by a set of jagged steps that let visitors stand in its heart.

The Buddhist temples of Yamadera, built into a mountain side, feature a viewing deck with sweeping views.

Not one, not two, but three natural bridges remain in this captivating spot post-sinkhole.

Discovered after draining a local pond, these ancient man-made caves are still a complete mystery.

Environmentally crucial raptors like eagles and vultures are kept and protected in this massive sanctuary.

These Great Lakes sea caves accessible by boat in the summer turn into temples of ice reachable by foot in the winter.