Northern Ireland's Brobdingnagian stepping stones.

The hidden "ballroom" under a mansion lake was built by a criminal who ate a cyanide pill during his trial.

The 19th-century vessel floats proudly on Lake Titicaca, but its journey from Britain to the Peruvian altiplano was far from smooth sailing.

A kitschy Italian medieval-style castle incongruously located amidst one of the most historic towns in the Peruvian Amazon.

A jungle cave in Peru of unknown depths, otherworldly sounds, and strange nocturnal birds that navigate by echolocation.

The world's fifth tallest waterfall is a spectacular silver chute of water that cuts through the cloud forest in northern Peru.

With nearly double the depth of the Grand Canyon, this Peruvian canyon is one of the deepest in the world.

These steeply terraced ruins are a stop along the Inca Trail to Machu Picchu.

If you’ve ever seen a picture of Machu Picchu, then you’ve seen a picture of Huayna Picchu—you just didn’t realize it.

This scalding hot river was thought to be a myth until one geoscientist made it his quest to study the mystical waters.

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

A brightly colored natural bridge formed by mineral-rich hot springs high up in the Andes.

Mineral springs believed to hold therapeutic properties draw in visitors from all over.

An Argentinian businessman facing terminal cancer built this whimsical medieval village using salvaged materials.

A neo-Gothic castle in the Argentinian countryside.

A gateway to a mysterious network of underground tunnels.

The soaring gondola lines form the longest aerial cable car system in the world.