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

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

A humid oasis combines recreation with exploration in a unique underwater cavern.

This ancient sinkhole-turned-healing-pool is a treasure trove of archeological discoveries and may even be the Fountain of Youth.

A unique collection of more than 250 rocks and minerals located on a university campus.

One small town in the Pacific Northwest transformed itself into a Bavarian-themed tourist destination.

This remarkable collection devoted to the study of fish includes 1 million preserved specimens from all around the world.

Tour the original street level of Port Angeles, buried underground in 1914.

Hundreds of hopeful gold miners came here to get rich, but only two years later the small town was deserted.

Where else would a linchpin of post-colonial Native American cuisine anchor the menu but a museum?

Shoreline strewn with the remains of ghostly fallen trees.

A "sinister, whimsical, tacky, and really orange" public art installation hidden under a Seattle bridge.

An extraordinary mixture of natural beauty and man-made phenomena.

A tiny red pebble marks what may be the quietest outdoor spot in the United States.

The longest continuous lava tube in the continental U.S. offers 2.5 miles of dark explorations for the adventurous.

This semi-secret garden in south Seattle emulates a traditional Japanese garden using the plants of the Pacific Northwest.

A 100-year-old purveyor of curiosities, curios, and kitsch featuring mummies, shrunken heads, and a Fiji Mermaid.

A walk through the historic city center, under the streets of Seattle.

Surat Thani's official flower—and the world's largest—smells of rotting meat.

Legend says that this short Canadian tunnel still holds the dying screams of a girl who burned alive.

With well over 130 falls and cascades to brag about, Hamilton, Ontario has earned its stripes as the waterfall capital of the world.

An abandoned Victorian-era amusement park is rusting away amidst luxury houses.

This natural sea cave hides a small wonderland of natural turquoise beauty.

Historic psychiatric asylum and most-filmed location in the Great White North.