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

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

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

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

Khmer Rouge's high security prison.

A battle between nature and architecture in the Cambodian jungle.

This mysterious but iconic tapered tower appears in many Azeri fairytales and legends.

The building's fluid, wavelike walls are a true feat of architectural ingenuity.

A shrine of fire worship built on top of a natural flame.

This series of waterfalls tumble into a radiantly blue river.

The most complete statue of this Aztec god sits a top a throne carved with images of hallucinogenic plants.

The stoutest tree in the world.

The striking jade death mask of an ancient Maya king is displayed in a replica tomb in Mexico City.

If you can look past the nearby sewer pipes, this urban sinkhole grotto is a mini-paradise.

An elaborate Mayan city shrouded in alien conspiracy revealed the tomb of Pacal the Great.

No telescopes, no power, no gift shop: The Observatory of Chichen Itza, one of the world's oldest observatories, takes astronomy back to basics.

Gilded heaven for philatelists and architecture freaks, still in full working order despite sitting atop tremulous ground.

A disquieting Aztec sculpture displays hundreds of stone skulls representing the victims of human sacrifice.

A magical sinkhole on the Yucatán Peninsula is adorned with mini waterfalls and hanging vines.

Every equinox this Maya pyramid puts on a spooky ancient light show.

The famous artist couple lived and worked here, in two different houses separated by a bridge.

66,000 pieces of art, donated by one of the world's richest men.

Part bookstore, part café, and part forest.

Frida Kahlo's childhood home, now a museum of her life and works.