Originally a leper colony, the island is now an Armenian monastery that's home to an incredible manuscript library and eclectic museum.

Thousand-year-old Viking runes adorn an ancient Greek lion at the entrance to the Venetian Arsenal.

A museum on the history of Paris, including a set of Napoleon's toiletries, Proust's room, and relics of the Revolution.

A mechanized clock where a man fights off a dragon, crab, and rooster.

Indents in the pavement are all that remain from a grisly death machine in Paris.

This Parisian café sticks almost exclusively to an ethos of reuse.

The skeletal frame of a decommissioned gas-pumping station offers breathtaking views of greater Berlin.

The final resting place of many of Germany's most famous communists.

A museum in the building where Nazi Germany signed its surrender tells the story of World War II from the Soviet perspective.

Someone loved this song enough to carve all of its lyrics onto a tree trunk in a Berlin park.

Home to 10,000 medical specimens including the remains of Rudolf Virchow's extensive collection of pathological specimens.

This World War II bunker now survives as a documentation of the Nazi regime and war crimes.

On the Spree bank, discover one of the last reminders of a symbolic wall that divided, and was torn down by the people.

Also known as the Blue Church, the building was consecrated to the daughter of Andrew II.

A modern sliver of architecture in Roma.

A magnificent waterfall is also home to the remains of a Roman hydraulic engineering system.

More sculpture than building, this architecturally significant temple was built on the spot of Saint Peter's crucifixion.

This Roman arch marks the location of an ancient gate at one of the Seven Hills of Rome.

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.

The slender brass strip in Prague's Old Town Square was used to tell time from 1652 to 1918.

The first museum in the world devoted to sexual gadgetry.

This memorial to the victims of the Romanian Revolution of 1989 is often compared to a potato on a skewer.