Contrary to what one might expect, ice forms inside this small cavern during the summer and melts during the winter.

At nearly 1,000 feet long, this astonishing glass suspension bridge is one of the longest in the world.

The world is full of swimming holes, but few compare to Samoa’s idyllic To Sua ocean trench.

An unmarked, overgrown path through dense vegetation leads to the largest ancient structure in Polynesia.

A museum now occupies the mansion in Samoa where the prolific Scottish writer chose to spend the last years of his life.

A desert island with both a buried treasure and a famous castaway.

This narrow coastline trail through the dense Kauai wilderness is among the most beautiful and dangerous in the world.

A once-glowing grotto at the bottom of Waikapalae Wet Cave.

An authentic replica of an Asian temple and garden hidden amongst the natural beauty of Hawai'i.

A Hawaiian stairway to heaven—that you can't climb.

A tunnel of hardened lava along Maui’s famous Road to Hana.

A series of waterfalls and pools that flow through the 'Ohe'o Gulch and into the ocean.

A priest with no formal artistic training used basic house paint to create gorgeous religious scenes inside this historic church.

A lake with hundreds of ancient skeletons surrounding it. The surprise is what killed them.

Staves, storm-calling, and of course, necropants.

The ruins of a lighthouse on the island Amelia Earhart never reached.

An abandoned guano-mining city in the South Pacific.

Island of trash twice the size of Texas floats in the Pacific.

The world's largest aggregation of great white sharks is at a mysterious spot in the middle of the ocean.

This airstrip atoll is uninhabited by humans, but absolutely full of birds.

Submerged lava formations create incredible waterworks.

This industrial area was the dumping ground for massive amounts of trash, some of which washes up as tiny bits of sea glass.

This blowhole is supposedly caused by a trapped monster.

This former luxury resort in Kaua'i is now an abandoned relic.