A secret climbing tree hides along the side of a Costa Rican road.

Balanced rock sculptures pay tribute to a murdered conservationist and his pioneer wife.

These mysterious ancient stone spheres were created by a civilization lost to time and are now mostly lawn ornaments.

This neon blue river gets its color from a unique mix of bacteria and volcano minerals.

Sloth rehabilitation center in the jungle of Costa Rica.

Hidden amid the tropical forest in the Caribbean Sea are the decaying ruins of the Cocaine King's luxurious island party home.

Erected in 1803, it is the first astronomical observatory that was built in the Americas.

A park with one large cat sculpture and 15 smaller ones, all painted by different Colombian artists.

Colombia's biggest botanical garden contains plants from all across the country.

An unusual and beautiful form of mass transit serves the city's steepest neighborhoods.

A cozy bookstore and coffee shop in the heart of Cartagena's Old City.

Colorful lights and mirror-like brine pools create trippy illusions within the historic mine.

A dangling church built over a Colombian gorge.

The Andean town where every single building is decorated with a brightly colored frieze.

An explosion of natural color known as "the river that ran away from paradise."

A painting in the historic Cathedral Basilica depicts Jesus and his disciples dining on a traditional Peruvian menu.

These giant mummies are set ominously into a Peruvian cliffside and topped with real human skulls.

Huge stone depressions which may have acted as an Incan agricultural experiment.

One of the world's tallest waterfalls wasn't revealed to the world at large until 2006.

A market for witches is hidden within a train station.

A remote candy-striped mountain in the Peruvian Andes straight out of the pages of Dr. Seuss.

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

This remote stretch of sand is a penguin lover's paradise.

Built for the 1962 World Cup, this fully functioning botanical clock is still ticking.