A socialist building dedicated to teachers showcases one of the largest Soviet mosaics in the world.

More than a millennium's worth of municipal records preserve the political history of Austria.

A neo-Gothic church built to thank God for saving the Emperor of Austria from an assassination.

A former military hospital is now used to study and preserve artifacts of the Acropolis.

The most impressive of Basel's three remaining city gates.

A significant example of Czech cubist architecture—a style you won't find anywhere else in the world.

A retro Yugoslav congress, cultural, and business hall built in the 1970s, with an iconic world clock.

Two buildings named after their windows that make it look like a sea of television sets plastered to a wall.

A futuristic rocket marks the spot where three borders meet.

Huge stairway leads to this massive gallery.

This unique museum focuses on the Siege of Sarajevo through children's eyes.

A 14th-century Serbian Orthodox church that was once converted into a mosque under the much-disfavored Ottoman Empire.

An Art Deco Icarus statue adorns this abandoned gem of Yugoslav Modernist architecture.

The oldest statue in the Netherlands has survived relocation, bombardment, and burial.

Considered an architectural abomination by some, this metal-clad building is known as 'little red riding hood' by locals.

Hungarian Jews were ghettoized during the Second World War, but little remains of the original wall that closed the Jewish people off from the rest of the city.

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

18m long sarcophagus of a constantly growing dead prophet.

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

Where Stoddart and Connolly suffered in the infamous Bug Pit.

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

A building facade covered with the statues of 11 giants of Tajik literature.

The world's second-tallest flagpole stands proud despite dropping rank.

This dark, damp, perilous tunnel is the only passage from north to south Tajikistan.