Ain't no party like a ghost town party.

The intricate stonework of Machu Picchu serves as a testament to Incan engineers.

Plundered and left asunder by grave robbers, this ancient necropolis has been painstakingly pieced back together.

A forgotten remnant of the Soviet Union, Transnistria is an unrecognized country hidden behind a heavily militarized border between Moldova and Ukraine.

Inside a former cabaret, seven floors of erotic art.

A horde of stray cats rule in this secluded Parisian cemetery under a bridge.

Down a cobblestone alleyway is a museum dedicated to Romanticism, with a secret garden.

The curious underground history of keeping Paris clean.

Museum on French naval history, with magnificent figureheads, a historic diving suit, and a boat used by Napoleon.

An odd museum dedicated to French fakes.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

Saintly bones pressed into a wax effigy of a Catholic superstar.

Statue of death tucked in the University of Medicine courtyard.

The history of radiation is on safe display at the foot of a radiation science laboratory.

Abandoned railway line circling the city of Paris.

This bright yellow relic is the final survivor of a short burst of seashell-shaped petrol pumps.

Ornate and macabre headstone in one of the country's oldest cemeteries.

In upstate New York, gorgeous waterfalls and a watermill are slowly being reclaimed by nature.

Grave of the man allegedly responsible for a series of infamous murders in Boston in the 1960s.

Memorial of the Salem witchcraft hysteria in the town of Danvers, where it all began.

Home to secret Eastern Bloc spy equipment and the largest stretch of the original Berlin Wall outside of Germany.

A haunting collection of the vanished and disappearing natural world.

Once adorning a New York skyscraper, these reclaimed ruins now haunt an Indiana park.

A former copper mine which became a truly unsuccessful prison.