Hindu temple of the dead home to hundreds of long-tailed macaques.

An abandoned hotel in the highlands of Bali is shrouded in stories of ghosts, curses, and corruption.

Built to power trains, the engines in this building provided the entire city of Madrid with electricity during the Spanish Civil War.

This postmodern apartment block was designed to be a vertical neighborhood.

Abandoned for decades, trains still pass through the now-restored remains of one of Madrid's first metro stations.

Madrid's romantically ornate crystal palace has been offering shelter to plants and art for over a century.

The oldest restaurant in the world is this old-world Spanish eatery, still known for its suckling pig.

Paris' fabled purveyor of exotic taxidermy and natural history curios.

"In the Dark" Restaurant in Paris offers dinner in complete darkness.

France's national museum of scientific and industrial instruments.

A haunting collection of the vanished and disappearing natural world.

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

Abandoned railway line circling the city of Paris.

France's most famous cemetery, with some of its most curious tombs.

The engineering wonder and pleasure dome of a much-maligned emperor still holds undiscovered secrets.

This ancient trail climbs the mountain where a Latin League cult worshipped Jupiter, its main deity.

Also known as the Square Colosseum, this building is a prime example of fascist-era rationalist architecture.

Gods clash with machines in a power plant regenerated as a museum.

This beautiful park on the outskirts of Rome protects the ruins of two colossal ancient aqueducts.

The final resting place of the poets Shelley and Keats.

2300-year-old Roman road connecting the empire.

Where the leftovers of love affairs can live on forever.

Historic house-museum dedicated to the revolutionary gay graphic artist Tom of Finland.

A three-story, three-dimensional hobo clown in a tutu welcomes CVS shoppers.