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

A solemn reminder of the infamous World War II war crime that massacred almost all the men in a small Greek town.

One man has installed bathtubs into the Utah desert floor to harness the powers of a natural hot spring.

A boat ride through utter darkness, lit only by headlamps, reveals an emerald green pool locals believe is sacred.

The world's brightest bioluminescent bay.

On a small Puerto Rican island, banks of secret naval bunkers lie abandoned and filled with piles of office equipment.

These colonial murals are a fascinating hybrid of Spanish and Indigenous aesthetics.

The remains of an abandoned air force hospital located on a redeveloped Air Force base.

Sections of the iconic limestone columns have been left uncleaned as a reminder of the city's polluted past.

One of Auckland's oldest cemeteries was partially demolished during the construction of a major highway in the 1960s. 

The "Black Arch" guards the entrance to the picturesque Glens of Antrim.

The soaring gondola lines form the longest aerial cable car system in the world.

In a small Kentish seaside stands the former home of one of the greatest science-fiction writers.

Poet William Blake penned some of his most famous work during his brief stay at this beloved country cottage.

Abraham Lincoln's likeness rests at the top of this giant totem pole.

A defunct all-girls college which may be the resting place of H.P. Lovecraft's real-life Necronomicon.

This dry lake bed contains the oldest known petroglyphs in North America.

The highest dunes in California are the most likely place in the area to hear the Singing Sands.

The largest dune field in the Mojave offers a chance of hearing the 'singing sands.'

This dormant volcanic crater has been converted from a roiling pit of magma to a pleasant hiking spot.

The ghost town that ended up on Ebay.

A pair of large white marble lions guard this stretch of the Mojave Desert, and it is utterly mysterious how they got there.

The only pollutant in the clear blue water is sunscreen.

A mural of the Virgin of Guadalupe painted on the rock wall by canyon's religious namesake.