The ruins of an ancient island city built atop a coral reef in the South Pacific are spectacular and strange enough to have inspired H.P. Lovecraft.

A village on the east coast of England that has almost completely eroded into the North Sea.

Surreal riveted sea forts once protected the Kent shores from German attack.

Once the most densely populated place in the world, this island is now a ghost town.

Ruins of a German Castle on top of a towering stone pillar.

A self-built castle made by a mysterious man.

A reproduction of earth's many biomes.

The biggest solar telescope in the world helps reveal the secrets of our sun.

An abandoned facility that has become a place of ritualistic satanic worship, or so rumor has it.

The remains of what was, not so long ago, the world's largest city.

A battle between nature and architecture in the Cambodian jungle.

Super-heavy Nazi architectural experiment.

The enigmatic and seldom visited ruins of a Mayan city-state.

Every equinox this Maya pyramid puts on a spooky ancient light show.

It houses the remains of a 17th-century version of the Titanic.

The ghost town left by the worst nuclear disaster of all time is being taken over by nature and urban explorers.

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

17th century streets hidden under Edinburgh were once a breeding ground for the black death.

Between Neo-Pagans and Neo-Nazis, these strange rock formations have a curious cult following and a very strange history.

The seawater playground of gilded-era San Francisco burned to the ground in 1966.

This notorious Canadian mental institution was home to some of the first LSD experiments and origin of the word "psychedelic."

The largest earthwork effigy in the world.

One man's artistic vision is a small town government's legal battle.

The inspiration for H.P. Lovecraft's horror stories and Batman's Arkham Asylum is now a condominium complex.