The mysterious round rocks of Schooner Gulch.

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

Submerged lava formations create incredible waterworks.

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

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

This black shoreline is made up of exploded lava particles.

A true treehouse near Hawai'i Volcanoes National Park.

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

Ottoman-era houses lovingly preserved.

This ancient subterranean megalopolis is known for the hot oil traps that were installed above each of its entrances.

Thousands of rusting train cars have been slowly falling apart on the edge of Greece's second largest city.

Hidden in a secluded Greek cove is a pristine beach marred only by the rusting smuggler's hulk stranded on its shores.

A spectacular cave and a beguiling lake.

The hallucinogenic center of the ancient world.

Monasteries on rock pillars, once accessible only by frayed ropes.

These spectacular, symbolic serpents lie within the shadow of the Great Temple.

This fantastical house shaped like a seashell brings aquatic design to architecture.

An Aztec snake god has taken the material form of an apartment complex.

Extraordinary sculpture garden created by an eccentric English poet.

The largest cave shaft in the world is home to thousands of birds and popular with BASE jumpers.

A lovers' beach, tucked below the surface of the island, provides a safe haven for romance.

A Lovecraftian altar of nightmarish bronze chairs sits ominously on a boardwalk in Puerto Vallarta.

There is nothing like a religious festival celebrated with blow-up sledgehammers.

Peaceful gardens hide an underground torture museum.