The world's brightest bioluminescent bay.

Hidden beneath the streets of London is a secret subway that only carried mail.

The largest of London's subterranean rivers and once a mad, bad center of London life.

The world's largest collection of witchcraft regalia.

A seemingly endless landscape of pure salt stretches far across Bolivia.

A massive underwater sinkhole made famous by Jacques Cousteau.

A beautiful and abandoned New York subway station from 1904, complete with chandelier.

During prohibition, corrupt city officials ran drinking dens under the streets of Downtown Los Angeles.

The remains of diamond fever taken over by the desert.

Gargoyle head that brings good luck.

There is only one place in the world where the corners of four nations come together.

These historic defenses ensured the city within would survive hundreds of years of occupations, sieges, and invasions.

Ride the subways of yesteryear.

The world's highest and most dangerous infinity pool lies at the precipice of Victoria Falls.

This ironic war memorial thumbs its nose at a campaign of inedible humanitarian aid food products.

A number of craters left by fatal mortar strikes have been filled with red resin to remember those lost during the Siege of Sarajevo.

This abandoned airplane hanger is said to have once been a top secret launch facility.