This alley off Edinburgh's Royal Mile contains remnants of the city's seedier history.

Now home to a drinking establishment, this building has a macabre history.

A succession of eerily contemplative iron figures lead from a Scottish museum to the sea.

One of two Irish-style round towers in Scotland, this structure has mysterious origins.

The unique waterfall in Iceland's south features a backdrop of geometric black lava columns.

A beautiful Greco-Roman structure houses a well once believed to have healing powers.

A labyrinthine network of chambers with a storied past hides below Edinburgh's South Bridge.

A spiral staircase connects the limestone cave with Pembroke Castle, birthplace of King Henry VII.

Every president in history is immortalized in bronze in downtown Rapid City.

Thanks to a loophole in property ownership, this alleyway has become a cacophonous street gallery.

One of America’s oldest and spookiest hotels, thanks to the residency of ghosts, dead presidents, and Alfred Hitchcock.

The highest point in South Dakota contains the ashes of Valentine McGillycuudy, the "Holy White Man."

Hidden behind Lincoln's head is a 70-foot-long chamber containing enamel plates documenting American history, sealed in a teakwood box in a titanium vault.

The granddaddy of all tourist traps, built on ice water, jackalopes, and a giant dinosaur.

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

An antique Beechcraft airplane serves as a giant windsock for people driving through the blustery open country of eastern Wyoming.

This shallow pit was once used to send over 20,000 buffalo plummeting to their death.

The first declared National Monument in the United States.

A mysterious Neolithic tomb is perched along the edge of a modern golf course.

This dramatic landscape hidden on the Isle of Skye looks as though you've stepped into the magical realm.

Inside this art and oddity-filled shop, a small room filled with secrets.

This old abandoned sign flickers to announce a motel that isn't even there.

Ghost town with a beer-drinking goat for mayor.

A relatively obscure antihero from the Marvel Comics universe adorns a wall inside Iceland's main airport.