A giant "X" symbolizes the blood spilled from the brutal Juárez drug wars.

An emerald-green grotto just a short trip from Austin.

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

Part bookstore, part café, and part forest.

This fantastical house shaped like a seashell brings aquatic design to architecture.

An Aztec snake god has taken the material form of an apartment complex.

A gargantuan crystal kingdom.

A lovers' beach, tucked below the surface of the island, provides a safe haven for romance.

Extraordinary sculpture garden created by an eccentric English poet.

The largest cave shaft in the world is home to thousands of birds and popular with BASE jumpers.

Beach instrument turned bed and breakfast.

A massive underwater sinkhole made famous by Jacques Cousteau.

Mother Nature outdoes herself with this stunningly beautiful set of caves carved into marble.

Sloth rehabilitation center in the jungle of Costa Rica.

Commercial airplanes land mere feet over the heads of sunbathing beachgoers on this tiny island.

Enchanting cave with a river crashing through the roof.

A remarkable geological formation resembling a forest made of stone.

A set of ancient drawings in the desert of Peru that are so massive, many of them can only be fully seen from the sky.

Crumbling remnant of Rio's colonial past tucked behind Corcovado mountain in the neighborhood of Cosme Velho.

Plagued by riots, celebrity injuries and a tragic death, this amusement park has been demolished.

The intricate stonework of Machu Picchu serves as a testament to Incan engineers.

Preserved Inca city and site of the last Inca stronghold against the Spanish conquistadors.

A valley of unique erosion patterns lends to a view like nothing on Earth.

An ancient capital city that dates back 3,000 years old and harbors many surprises.