The oldest and smallest cemetery in Paris is only open to the public twice a year.

A Parisian exterminator's shop whose storefront displays stuffed rats hanging from traps.

Exquisite wall sculptures carved in secret by an early quarryman in an obscure corner of the Paris Catacombs.

Walk upon the mementos of the dead in this Parisian courtyard paved with medieval tombstones.

High atop the Eiffel Tower is a small apartment built exclusively to entertain the science elite and make the rest of Paris jealous.

One of the oldest medical collections in Europe focusing on rare surgical instruments.

This roadside shrine to an unofficial saint has welcomed the wishes and prayers of local believers for generations.

A popular shrine where the Blessed Virgin allegedly appeared in 1830, displaying a holy armchair and two incorruptible remains of Lady Saints.

Xul Solar was an artist of alternate worlds, inventor of languages, and dreamer of utopias.

Stenciled handprints and wall paintings dating back 10,000 years, some of the earliest forms of cave art.

Bomb tests and sheep ranchers share the world's largest military land base.

An Australian lake whose pink hue defies scientific explanation.

A taxus-tree to which Julius Caesar reputedly tied his horse.

Africa's Venice on stilts.

An extraordinary mix of Phoenician, Roman, early Christian, and Byzantine ruins beautifully set overlooking the Mediterranean.

This dizzying span over the ancient Algerian city was once the highest suspension bridge in the world.

The original resting place of Queen Cleopatra and Mark Antony's only daughter.

Long-abandoned art nouveau baths beneath Milan's Piazza Oberdan.

One of the world’s smallest bars, just 13 square feet, is brimming with speakeasy flair.

Giant eggs, walls of bread, and nightmare surreality mark the largest collection of works by Salvador Dalí.

Twenty-three trees, each paired with a basalt stone, line a street in Chelsea, continuing an urban project started by German Fluxus artist Joseph Beuys.

Featuring the last fully walkable parapet walkway in Europe.

A room filled with frescos that make it seem like the walls are crumbling down while giants die in despair.

This one-of-a-kind Roman arch is not actually dedicated to the god Janus.