A colorful Peruvian city of the dead.

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

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

The Uros people live on floating reed islands in lake Titicaca.

This Peruvian canyon is filled with geometric salt pools that have been being harvested since the Incan empire.

This stunning 15th-century royal hill fort preserves the age of chivalry in Rajasthan.

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

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

The world's northernmost aquarium looks like it has fallen over.

India's first open-air public art district sits in the heart of the country's capital.

Ancient traditions and surreal birdwatching come into sharp relief along one of the world's most polluted rivers.

This striking landscape in northern Vietnam contains both geological and archaeological wonders.

La Monte Young and Marian Zazeela's "Dream House" will immerse you in an ever changing world of sound and light.

Sweden's first nuclear reactor, R1, can be visited 25 meters underground.

A Japanese video game arcade hides in the back of a Swedish pool hall.

In Portugal, a secluded stretch of untouched natural beauty hides at the bottom of a steep hill.

A unique seaside cave where Aleister Crowley faked his own death.

Secret North Korean passage discovered below the world's most dangerous border.

The abandoned hospital whose elaborate ghost stories cover up the dirty truth - an uneventful sanitation issue and other mundane reasons for its demise.

One of the oldest temples in Ho Chi Minh City, dedicated to a deified Chinese military leader.

This tiny Vietnamese village is known for eating snakes and serving their still-beating hearts in shots of vodka.

A sculpture park that takes the use of clay to a whole new level.