In the heart of Luxembourg's "little Switzerland" weaves a breathtaking natural sandstone canyon with a mythological past.

This Tudor cottage is adorned with many canary-clasping cats, which originally served as a reminder to a local clergyman of his pet's murderous ways.

This 18th-century water provider for Aranjuez was refurbished in 2013 only to be neglected again.

There's light and a dreamlike panorama at the end of this tunnel.

Thousands of bats stream out of caves every night on the edge on Thailand's second largest park.

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

This cavernous swimming spot doubles as a home to the largest known colony of bats in Central Asia.

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.

A well-studied colony of endangered bats roosts in this abandoned Victorian Gothic mansion.

This breathtaking island on Rwanda’s Lake Kivu is a haven for thousands of fruit bats.

A massive cave once a secret military base is now home to thousands of bats.

Abandoned railroad tunnel is home to a colony of three million Mexican free-tail bats.

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

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

Home to the largest urban bat colony in North America, estimated at 1.5 million bats.

The summer home of the largest colony of bats in the world.

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

This museum dedicated to the history of the medical bone trade and human osteology.

This massive wooden building contains a giant Buddha, healing pillars, and tame deer wandering the grounds.

The smallest country in the world.

Dedicated to one of Spain’s most talented painters and also one of the least known.

This arcade is one of the last places to catch a public performance by the now-defunct ShowBiz Pizza's house band of animatronic animals.

More than 100 antique vending machines housed in a used tire shop sell everything from candy to sake and ramen.