Miles of man-made caves and tunnels are currently used for cultivating mushrooms.

A chapel on a volcanic core, marking the end of a successful journey.

For centuries young Thai men used this Giant Swing as a slingshot to heaven.

This gem-encrusted temple is said to contain some of the Buddha's hair which can make the deaf hear and the blind see.

Gigantic unfinished stupa and the world's 2nd largest bell.

The headquarters of the Mahanikai school of Buddhism, Thailand's largest monastic order.

This elephant kraal is the only one remaining in Thailand, dating back to the 16th century when these massive mammals were integral players in war and trade.

This bridge was constructed from the rubble of the infamous Bastille.

Egyptian Revival movie palace abandoned for decades and restored in 2013.

Paris' linguistic guide to the international language of, yes, love.

A haunting collection of the vanished and disappearing natural world.

Natural history museum celebrating biodiversity with a parade of taxidermy animals.

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

Medieval museum built over Roman baths that features famous tapestries of a lady and a unicorn.

The remaining relics of the patroness of Paris lie in a chapel under a striking double spiral staircase.

A museum which takes visitors to the côté obscure of Paris.

Dolls of all shapes and sizes display the eras of femininity in this spooky and beautiful collection.

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

The oldest stone house in Paris was built by its most famous alchemist.

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

A stone face watches over the river.

France's national museum of scientific and industrial instruments.

Dedicated to the art of hunting, with juxtapositions of contemporary art.

Statue of death tucked in the University of Medicine courtyard.