This three-chambered cave is the only protected natural bat hibernaculum in Quebec.

This abandoned railroad tunnel is now home to a micro-colony of bats and a ghost train.

Take a hidden path to the mouth of the cave to watch millions of bats swarm at sunset.

The world's largest occupied bat houses hold hundreds of thousands of flying mammals.

This unique tower has been home to malaria-fighting bats for 100 years.

Each summer, the migratory bats living beneath the bypass form "batnadoes" at dusk.

This large cave is a summer home to thousands of bats and has a rich history dating back to prehistoric times.

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

Abandoned silver mine strewn with wrecked and twisted structures.

On a remote island, legend has it that a fiddler and his wife were turned to stone.

A towering Art Deco movie palace made to look like a Mayan temple.

This beautiful vintage movie palace has seen little change in form or function since the 1920s.

One of the last of the great 1920s movie palaces is a Floridian Greco-Spanish-Persian dreamscape.

This historic theater's pipe organ still accompanies silent films just like it did in 1929.

This shrine dedicated to a legendary swordsman has become a pilgrimage site for the ill and infirmed.

A replica of a famous Greek statue adorns the front of the unusual home of architect and alchemist Humberto Pittamiglio.

This quarter-mile tunnel under the Bluff in Pittsburgh bends at a 45-degree angle.

One of the few places where you can visit a cenote and Maya ruins at the same time.

At the foot of a waterfall lies a peaceful swimming lagoon and evidence of over 60,000 years of human habitation.

A clear blue swimming hole with hidden caves, still unexplored.

A long-forgotten Victorian swimming hole is still a fun spot for a dip.

Unparalleled stargazing, one of Colombia's best observatories, and a swimming pool can all be found in the middle of this ancient tropical forest.

Locals use these rock pools and waterfalls for swimming and cliff diving.

The abandoned zoo enclosures offer a perfect place to experience the other side of the bars.