Earth's tallest volcano is sacred to Native Hawaiians, and home to a dozen world-class observatories.

Mirrors and glass shards cover every inch of this arrestingly beautiful mosque.

Bell tower juts out from a village buried under a lake.

A Romanesque tower appears when water levels drop.

A submerged village appears when dam levels drop.

A town church once nearly submerged by the damming of a river is now hauntingly visible as the water recedes.

An ancient Egyptian temple in the middle of Madrid, Spain.

These ancient sacred grounds granted amnesty to those who managed to reach them.

A controversial memorial at the place where Captain Cook met his violent end.

Race through the maze, get your name on the sign.

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

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.

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

This WWII plane died a quiet death, and is now a garden eel playground.

Take shelter from Hawai'i's tropical heat under the massive canopy of largest Banyan tree on the island.

This blowhole is supposedly caused by a trapped monster.

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

This once luxurious Catskills resort is now a haunting ruin.

An abandoned subway tunnel that could have reinvigorated Staten Island still lies somewhere beneath this Brooklyn park.

Two stunning 17th-century libraries and a cabinet of curiosities.

This pair of small sea rocks has been "wed" using rope and ancient Shinto tradition.

This former steel and coal plant is now a neon-lit industrial fantasia.