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

Jesus' footprints and the first catacombs in the world.

Architectural monsters are devouring this palace's every door and window.

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

2300-year-old Roman road connecting the empire.

The only "Egyptian" pyramid in Europe and the legendary tomb of Remus.

Rome's semi-secret peephole vista is also a former Crusader stronghold.

This hidden Art Nouveau courtyard is an opulent feast for the eyes.

Architectureal fantasy quarter of Rome.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

An all-American grocery store in Paris sells U.S. "cuisine" like Pop-Tarts and Heinz ketchup to homesick ex-pats.

The celebrated eyesore created by starry-eyed sweethearts.

A quaint medieval harbour where Benjamin Franklin landed in 1776.

The precise origins of this pink sandstone temple are unknown.

This tiny cafe is one of the last meeting places of its kind, allowing revolutionaries a place to plot.

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

This hidden garden boasts amazing views of Lyon.

Half a century after it was abandoned, this ghost town is coming back to life.

This mountain trail inspired Nietzsche to complete his magnum opus.

Napoleon's childhood home is now open for people to explore the beginnings of France's short general.

A Christian retreat founded to welcome refugees fleeing from the Nazis during World War II.

An image of the legendary saint stands in the shadow of a cathedral she liberated.

A tiny, forgotten park of surrealist sculptures in Angouleme.

A copy of the Statue of Liberty greets visitors to the birthplace of Auguste Bartholdi.