Walk 2,300 feet above the ground on the "Troll's Tongue."

The behemoth beasts engaged in an epic battle is the second-tallest statue in the contiguous United States.

A massive underwater sinkhole made famous by Jacques Cousteau.

An abandoned theme park with a strange and tumultuous past.

The walkable ruins of an 19th century hotel, destroyed in a horse cremation gone wrong.

Nine Gardens in one—with tea service.

Made of giant chains and hung with shackles, this iron cross honors those unknowns who perished under American slavery.

A little slice of Japan and its aesthetics in London's Holland Park.

An Escher-inspired library dedicated to the wonders of the human mind, yet closed to the public.

This Berlin island is home to a flock of free-roaming peacocks, as well as a historic ivory folly.

This Hungarian castle was built out of cardboard and wood until it proved so popular that it got upgraded to stone.

The remains of an abandoned dinosaur theme park litter the woods just off the highway.

A 2000-year-old Roman amphitheater lies just below Guildhall Yard.

A modern ghost town whose inhabitants were driven away by the growth of nuclear power.

Constant erosion has created a surreal landscape of bleached and preserved fallen trees.

A ship that lived many lives under many names is now known merely as the "Ghost Ship."

The ancient tomb acts as a calendar that keeps perfect time.

These Great Lakes sea caves accessible by boat in the summer turn into temples of ice reachable by foot in the winter.

The "Fun Spot of the Desert" is now a haunting ruin, and a reminder that putting a water park in a desert is a bad idea.

A well-preserved Ancestral Puebloan ruin tucked beneath a desert cliff.

The quintessential Japanese rock garden has existed for more than 500 years.

A swing to dangle you off the very edge.

Ruins of a Carnegie family mansion on Cumberland Island.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.