Beneath Denmark's Højbro bridge, a bronze merman and his seven sons forever mourn for the mother and wife who left them for land.

A perfectly circular stronghold constructed in the 10th century is now a nucleus of Viking culture housing a museum, village, and reenactment of an epic Viking battle.

Climb to the top of its spiral spire for spectacular views of Copenhagen.

Beautiful scenery, history, science, and physics come together in this remnant of shipping lore.

The remains of a failed canal can be found in several towns near Lake St. Clair and is known historically as "Mason's Folly."

A Beaux-Arts triumph rises from decades of decay to become the heart of a new innovation district.

A prison-like structure guards the remains of a notorious Old West outlaw.

The bones of an old zoo crumbling in the shadow of a new one.

Advice-columnist's bell tower, paid for with pennies.

Over 100 million years ago, beach-bound dinosaurs left permanent marks on San Antonio's landscape.

One of the highest points in Bexar county offers birdseye views of San Antonio and a four-story stone tower.

The wood bears a hidden love note carved by a young Johnny Cash.

A gorgeous garden oasis with winding paths, stone bridges, and a troubling history.

A tall smoke stack and boarded-up buildings are all that's left of the pioneering plant.

This hidden sculpture garden full of Wild West art is one of San Antonio's best-kept secrets.

Conflicting markers on its floor tell a tale of two city centers in San Antonio.

Chicago's Navy Pier on Lake Michigan was a training hub for aircraft carrier pilots during WWII.

The twin towers in this Chicago fountain use 50 foot tall video screens to spit on people.

Four glass boxes hover over 1,000 feet in the air to give visitors an unparalleled view of Chicago.

Continuing the tradition of the dime museum in style.

Tile mosaics and quotes from Pablo Picasso add an artistic flair to these bus stop benches.

This rare triple-jurisdiction drawbridge passes through Virginia, Maryland, and Washington, D.C.

The 72-foot giant escaped confinement in a large patch of mulch only to be reburied in the sandy shores of the Potomac River.

Introducing the Green Fairy to her fawning masses.