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

The water-powered carriages are long gone, but for over a century this funicular railway has been the fastest route to the highest point in Paris.

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

Notorious artist squat renovated into legal studios.

A harem-inspired Moorish fantasy design in a Victorian-era Welsh castle.

London's last remaining public soapbox site has seen speeches from Karl Marx, Vladmir Lenin, and George Orwell.

A gigantic mechanical bull rages over unsuspecting passengers at Birmingham’s central station.

The largest public library in the United Kingdom was designed to reflect the industrial and artistic history of the city where it stands.

Controversially restored in the 1970s, this giant 15th-century mosque is shrouded in legend.

Once a luxurious flagship of the Soviet Union, this Brutalist structure remains a landmark of Tashkent’s communist past.

Prowl through this sprawling bazaar under a massive Soviet-era dome for delicious eats.

An underground world of gorgeous, palatial metro stations designed as a nuclear shelter complex.

This "tower of death" has acted as an observatory, a religious hub, and an executioner's lair.

Ancient barriers wrap around what was once an important stop along the Silk Road.

Light still pours into the ruins of this ancient Islamic observatory.

The Avenue of Mausolea is a series of grand palatial tombs.

The library houses an incredible collection of some of the world's most impressive books and manuscripts.

One of downtown Berlin's last reminders of its Communist past.

Berlin's old airport.

The bunker where Hitler took his own life is hidden under this deliberately ordinary parking lot.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

A small museum that celebrates the history and culture of the LGBTQ community in England.

An exceptional assortment of fossils recovered from private collections.

Enormous statue of the Emperor of the Mongols.