Rock-cut cave complex filled with ancient Buddhist artwork.

The world's second-largest sundial, made entirely out of stone.

Sacred Indian temple that’s all monkey business.

This otherworldly palace-mausoleum complex is the stuff eternal dreams are made of.

The remains of what was, not so long ago, the world's largest city.

The second-longest continuous wall on the planet protects a hidden secret in the deserts of India.

A palatial sculpture park was built illegally and in secret by a self-taught artist over 36 years.

More than half of this Indian palace is drowned but it looks all the more spectacular for it.

This complex of vertically-excavated Buddhist, Jain, and Hindu monolithic temples in India's Maharashtra providence illustrates a spirit of tolerance characteristic of ancient India.

Once an indicator of social class, the color blue has come to define this city on the edge of the Thar Desert.

A lake with hundreds of ancient skeletons surrounding it. The surprise is what killed them.

Centuries-old bridges grown from tangled roots.

The 953 windows undoubtedly make this the world's most beautiful screened porch.

Thousands of exquisitely carved stone water storage wells, hundreds of stone steps fill this exquisite medieval stepwell.

A century-old hotspot for jazz, frequented by everyone from Charlie Chaplin to Al Capone.

Try not to get slimed in Tribeca.

Collapsing castle on the Hudson river was once the storage site of military surplus business.

The mysterious wonder of an underground waterfall is illuminated by multicolored lights.

This massive store is home to an eccentric collection of vintage, retro, and peculiar goods.

No one knows how this Pacific Northwest spruce tree came to have so many trunks.

Giant, natural amphitheaters made of delicate geological formations called "hoodoos."

This strange seaside tower got its name from a wealthy eccentric who would hide coins among its stones.

Bigfoot prints, Feejee mermaids, and haunted dolls on display in a tiny North Carolina town.

The inspiration for H.P. Lovecraft's horror stories and Batman's Arkham Asylum is now a condominium complex.