These unique markers designate the route American forces took during the Liberation of France.

An effigy of a trapped paratrooper dangles from a Normandy church to commemorate one remarkable D-Day event.

Bloodstains can still be seen in this medieval church where two medics saved lives on D-Day.

The Lone Star plaque hangs in a bombed-out bunker in Normandy to honor a Texan colonel's heroic actions on D-Day.

A memorial to the nearly 10,000 American soldiers laid to rest on the beaches of Normandy during WWII.

This grubby wall is said to be one of the Earth's esoteric energy centers.

Inside this Krakow church, an explosion of psychedelic color.

Down this Cracovian street resides a plaque with a stark message about the city's air pollution.

A statue commemorating a Polish dog who took his role as man's best friend very seriously.

At first glance, this area seems like just another city park, but the lush landscape hides a dark past.

There are thousands of tributes and memorials to the King, but none quite like this one in a Kraków city park.

Beneath Kraków Old Town's main square lies a hologram-filled medieval market vampire graveyard wonderland.

This man-made mound monument was built out of soil from all across the Polish empire.

Underground hospital complex constructed by slave laborers during the German occupation of the Channel Islands.

One of the world's smallest prisons boasts just two small cells.

A quirky mausoleum celebrated once every five years with young dancing girls, widows, a tax man, and more.

A sturdy relic of Britain's once crucial gunpowder industry is now a haunting Cornish ruin.

The largest greenhouse in the world is home to over one million types of plants.

A hidden tunnel leads to an abandoned slate quarry that's now a secret swimming spot guarded by cliffs.

A section of a historic wooden trestle viaduct is preserved next to the railway line it once carried.

This 19th-century island fort built to protect against an invasion by sea.

This former military airfield's claim to fame came from a lucky accident during the Second World War.

This pedestrian walkway cuts through a cemetery and over several burial vaults.

A 19th-century funicular railway shuttles visitors up this surprising sea cliff to one of the world's largest camera obscuras.