This Byzantine Church was moved from Paris to Athens block by block.

The only ancient site that remains on the south bank of the sacred Ilissos river.

The ruins of an ancient mansion sits in front of and underneath a contemporary art gallery.

A crushed gate and giant bronze head serve as a reminder of Greece's fight for freedom.

A Byzantine-era church hidden in a wooded area below the Acropolis.

An ancient octagonal weather station named for the eight Greek gods of wind.

A museum dedicated to one of Paris’s most famous residents, tucked into a corner of one of the city’s most famous squares.

Collection of antique taxidermy and natural specimens, near one of Paris's oldest flea markets.

What looks like a normal building is really a hollow facade hiding a subway vent.

One of the oldest masonic museums in Paris.

19th century pendulum and a clock restored by a rogue group of guerilla artists.

This museum houses an imposing skeleton army comprised of creatures great and small.

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

Once a 19th-century brasserie, this McDonald's exterior celebrates Alsatian design and the "King of Beer."

The world's largest bicycle shelter can hold more than 12,500 two-wheelers.