Once an unstoppable source of gold and silver, this town came to a grinding stop when the groundwater proved deadly.

A mountain of conch shells created by centuries of fishermen.

This huge pile of volcanic boulders hides a stunning network of secret grottoes.

This 18th-century tower is locally iconic.

Thousands of Mexican Free-Tailed Bats soar around an abandoned storm drain at sunset each summer.

The world's brightest bioluminescent bay.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

A huge communist-era propaganda monument and mural that offers stunning views of the Mongolian capital.

Built on the remains of one the Incas’ most important gathering spots, this square keeps the spirit of a fallen empire alive.

The large collection of pre-Columbian pottery might make you blush.

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

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

The stones of this Incan wall complex fit together so well you couldn't fit a piece of paper between some of them.

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

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

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.

Life and death are on parade at the most reliably perilous site of “the Great Migration.”

Two giant painted cooling towers make for one of the world’s most epic bungee jumps.

This road winds through the steep coastal cliffside offering spectacular views for those who brave the drive.

Formerly known as the Malay Quarter, Bo Kaap is a colorfully-painted suburb located in the “Mother City” of South Africa.

This African beach is home to thousands of rare mainland penguins that are known for their annoying voice.

Home to a timed geyser created by complete accident.

Home to the deepest rift anywhere on Earth.