This lonely minaret with an unusual decorative symbol is all that remains of a historic Ottoman mosque.

In this town's main square resides a statue of none other than the 43rd President of the United States.

The largest Roman amphitheater in the Balkans once held over 20,000 people, but managed to lay hidden for hundreds of years.

Once the fallout shelter of a dictator, this sprawling bunker is now a combined history museum and contemporary art gallery.

A museum dedicated to secret surveillance.

In the heart of Tirana, this underground nuclear bunker has been transformed into a museum.

What happens when you cross a mayor and a painter?

Its frescoes depict the likeness of Marshal Tito, Karl Marx, and Friedrich Engels burning in hell.

This virtually windowless mass of smooth concrete is the only Catholic church in the city.

A French artist's vague warning hangs over Belleville.

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

The tradition of open-air secondhand and antiquarian bookselling in Paris dates back to the Renaissance.

The narrowest street in Paris.

A surrealist timepiece by the artist of melting clocks.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

Stripes of human ashes cover a back lawn in the most sought-after burial grounds in Paris.

How did a French journalist’s grave become the sexiest statue in the cemetery?

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

One of the few surviving gates into Old Goa, the former capital of Portuguese India.

In Old Goa, the former residence of the archbishop now houses a permanent exhibition.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

Some believe this abandoned Brutalist masterpiece inspired George Lucas's Sandcrawler.

The ancient heart of Tunis is an enormous maze of narrow streets and alleyways.

This museum in the famously blue neighborhood of Sidi Bou Saïd showcases a traditional Tunisian lifestyle.