See just what life was like in a 19th-century prospecting town.

Natural rock water slides hidden in the remote forests of northern Idaho.

A mining town, now abandoned, was built in a canyon so narrow that the railroad ran right through the hotel lobby.

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

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

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

Now a pedestrian bridge, this was once part of a narrow-gauge railroad that ran along the east coast of Kauai.

This coastal cavern is associated with the Hawaiian god of creation.

Football field-sized microalgae production tanks on the Hawaiian coast create a stunning view from space.

This tiny Hawaiian island is slowly coming back to life after being bombed during naval training exercises.

This World War II-era bunker is now packed with posters and props from movies and TV shows filmed nearby.

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

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

A unique set of caves that spits waves back out into the ocean.

More than 2,000 species of tropical plants call this nature preserve and sanctuary home.

A prehistoric landscape hidden in the cliffs of Maha'ulepu.

A true treehouse near Hawai'i Volcanoes National Park.

Submerged lava formations create incredible waterworks.

The only royal palace on U.S. soil has been a territorial capitol, a military headquarters, and a prison for a queen.

Doris Duke's lasting collection of Islamic Art, hidden in a Hawaiian paradise.

This legendary urban waterfall creates a dazzling display of rainbows.

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

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

Watch the newest land on the planet form before your eyes.