Remnants of the Nazis' occupation of Denmark linger along the sand.

A preserved Nazi labor camp now has a Holocaust museum on site and memorials to the thousands that died while imprisoned at the camp.

A Red Cross memorial museum at the site of the Niš concentration camp that operated for four eventful years during World War II.

A Nazi concentration camp and Anne Frank's place of death.

The site of a concentration camp where inmates were made to take part in one of the largest counterfeiting operations in history is now hauntingly empty.

Once part of an ancient international harbor, it's now an all-you-can-eat shrimp buffet for flamingos and other water birds.

Monasteries on rock pillars, once accessible only by frayed ropes.

Earth's greatest purely vertical drop at 4,101 feet.

This 1,300-year-old marker is one of the finest and most complete early Christian crosses in Scotland.

400 million years of erosion shaped these fascinating seaside caves, which made an appearance on 'Game of Thrones.'

This short bridge is the only thing connecting a tiny Irish island to the mainland.

A trail of "Game of Thrones"-themed doors carved from fallen trees from the iconic Dark Hedges.

The atmospheric road was never meant to be so creepy.

The ruins of this medieval castle in Northern Ireland have inspired artists from C.S. Lewis to Led Zeppelin.

An eccentric garden of sculptures crafted in India decorate an Irish green space dedicated to Alan Turing.

On the Irish coast, 18 members of the Howard family are eternally resting in an Egyptian pyramid.

The oldest pub in Ireland may also be the oldest surviving bar in the entire world.

This ancient Irish religious site is covered in ancient carvings, many of which have barely aged.

A moody and picturesque riverside ruin overgrown with vegetation.

The skeleton of a whale that beached itself in this Irish town is now on display in their public park.

A stunning medieval castle owned and restored by the famed actor Jeremy Irons.

Traveling this mountain pass reveals quaint stone buildings, stunning Irish scenery, and a bridge said to grant wishes.

An Irish town has built a statue to a silent film actor simply thanks to the holidays he once spent there.

Perfectly preserved ancient monastery in an impossibly dramatic location on a rocky island in the Atlantic.