These 4,000-year-old tombs form a surreal landscape.

The ruins of a 19th-century aqueduct run through this Brazilian island's deep forest.

The only natural gorge in metropolitan Tokyo, with lots of greenery and ancient burial chambers.

A mysterious concrete hand reaches out from between the stones of Uniwersytecki bridge.

A small rural town hides Indiana's tallest waterfall.

This simple wooden cross is said to mark the grave of an unknown sailor who washed ashore nearby.

More than 500 years after his death, a medieval ruler's remains were found buried under a parking lot.

Tradition says that William the Conqueror dined on this stone after landing his Norman invasion fleet nearby.

Spend the night in this former asylum for the incurably insane, which claims to be one of the most haunted places in the United States.

Legend has it these caves were created by a deity called Ogba, who is said to live inside the winding subterranean caverns.

This cave in the heart of La Mancha is full of esoteric secrets.

Sculptor Vadim Bora's bronze felines pay playful homage to architectural features no longer extant along Asheville's Wall Street.

Local legend says a monk brought Christianity to Bornholm through his sermons in a cave inside this free-standing rock.

This church is home to a 1,600-year-old tree, but also a mysterious carved figure who may have been a pagan idol.

View Japan's most historic city from a cyberpunk walkway suspended 150 feet above the ground.

On the side of Christchurch Mansion is an enigmatic block of dark limestone that dates back to 14th-century Belgium.

Hidden in a cave on a small Taiwanese island, a stalagmite reported to look like the bodhisattva Guanyin.

A spring and an enigmatic cabin lie in a ponderosa pine forest in the heart of the Desert National Wildlife Refuge.

Once upon a time in Kamakura, a five-headed dragon fell in love with an Indian water goddess.

Is this amazing tableau depicting Gilgamesh and Enki 4,000 years old?

Italian horror legend Dario Argento’s own shop hides a sinister museum-dungeon in the basement.

Smack-dab in Campania’s volcanic fields, this scenic lake was once thought to be the gate of hell.

A sign marks where the two bodies of water meet.

A glimpse of the Pacific Northwest‘s indigenous culture in Washington, D.C.