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

Do these monsters look familiar? The gargoyles on this church are all from pop culture.

There is a strange little carving of a person seemingly crushed by a pillar behind the remains of St. Thomas Aquinas.

This Bordeaux parking garage has 712 indoor spaces, and one outdoor.

A small house sits between two huge rocks, with its back to the sea.

A pink sandstone column once used in ancient times to measure one's belly after a night of debauchery.

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

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

This little medieval church hidden in the center of Yerevan was lost and rediscovered—twice.

The ruins of a medieval monastery built on a perilous slope.

This medieval manuscript collection has some of the most obscure and ancient texts in the world.

This ancient monastery complex was transformed from an island to a peninsula when the lake was partially drained.

The world's longest nonstop reversible cable car soars through spectacular scenery to the medieval Tatev Monastery.

After visiting hours, this picturesque waterfall is essentially turned "off" to be used for hydroelectric power.

This series of Armenian caves held the oldest brain, shoe, and winery in the world.

She asked for a potato cellar and over the next 23 years he gave her a network of holy caves.

Centuries before the modern seismograph, Armenian monks measured quakes with this tilting pillar.

This Armenian monastery was carved out of cliffs and named after the spear used to stab Jesus.

The most visited pilgrimage site in Armenia once held a saint in a pit for 13 years.

Right up until the 20th century this network of man-made caves was the biggest village in Eastern Armenia.

A scenic canyon with thick forests and historic ruins.

A geological oddity topped with a 2,000-year-old pagan temple.

This ancient subterranean megalopolis is known for the hot oil traps that were installed above each of its entrances.

Legend says if you stick your thumb in the hole and it gets wet your wish will be granted.