This museum in a Paris apartment gives a unique look at the iconic French singer's life.

This banal Parisian entranceway is not what it seems.

Pitié-Salpêtrière was the dumping grounds for women who received the dreaded diagnosis of "hysterical."

A 14th century bridge built as a fortress, where the devil lurks on one of its towers.

Twelve grave-faced marble angels guard the emperor's tomb at Les Invalides.

Ancient paintings known as the "Sistine Chapel of Cave Art."

One of the greatest maze designer’s greatest mazes.

In the best of all possible worlds, everyone will get a chance to see this statue in which Voltaire's heart is interred.

An overlooked marble is the only surviving in-place 18th century example of the measurement that changed how we define distance.

This French ghost town from World War II has been left as a memorial to German atrocities during World War II.

Home of the first female Hungarian poet, where her secret writing lay hidden for over a century.

This 11th-century structure is one of the oldest churches in Romania.

Religious structure known for its sculpted details.

Once the legendary capital of the Dacian Kingdom, this city has been reduced to mere ruins.

Climbing to the top of the cathedral's bell tower offers sweeping views of these medieval ruins.

A medieval church built up to defend its village.

Nine centuries-old fortresses guard the walls of this medieval Romanian city.

Romania's triumphal arch looks out over Bucharest.

This communist behemoth is the heaviest building in the world and a legacy of a brutal regime.

A fire once nearly devoured this gorgeous 14th-century Gothic cathedral.

The preserved arm of a third-century sorcerer is believed to have the power to lift curses and spells.

This snug medieval lane is one of the narrowest streets in the world.

One of the oldest churches in Romania is believed to have been built on the site of a pagan temple.

A muddy alien landscape that is home to rare species of exotic plants.