At the point of oceanic inaccessibility, you can't get farther from dry land without leaving the planet.

The oceanic dumping ground where spaceships go to die.

Perhaps the most spectacular grotto along the Algarve coastline.

Overlooking Puget Sound sits a garden with a Buddhist prayer wheel and an elaborate labyrinth.

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

The remote outlaw hideout of Jesse James, Butch Cassidy, and the Sundance Kid.

Over a thousand feet beneath the Detroit streets is a subterranean metropolis few are allowed to enter.

Also known as "Robin Hood's tree," this tree became a famed location along Hadrian's Wall before it was cut down in an act of vandalism.

An architectural gem nestled into a promontory overlooking a prehistoric landscape.

This abandoned Victorian-style house was built in 1884.

This castle played host to the largest great hall found in medieval Central Europe.

It took over 100 years to decode this enigmatic epitaph for two buried brides.

A grove of "candelabra redwoods" deep in California's Lost Coast.

A scrap-metal sculpture recalls an infamous 19th-century camel.

This former lieutenant governor's home is brimming with curiosities.

A former reservoir that was only recently discovered after more than 60 years of disuse.

The ship that got left behind.

An eerie site of reverence for those who have completed an epic journey.

On the Oregon coast there is a natural hole that seems to be draining the sea.

This jaw-dropping 19th-century bridge uses its reflection to form what appears to be a perfect circle.

A devilishly named gorge that was a sign of salvation for many pioneers.

On Japan's Tashirojima Island, cats are king.

One lonely, modern pyramid has gone from corporate think tank to deserted boondoggle.

This abandoned bridge to nowhere stands secluded in the woods of a Cleveland suburb.