A former smithy turned cultural hub with the capital's largest mural space.

An abandoned pasta factory in the centre of Bucharest, once home to Bulgarian revolutionaries and a hub of crime.

A prime example of socialist modernist architecture, wrapped in a enormous fresco about the media.

One of Serbia's oldest luxury hotels and a nostalgic echo to Yugoslavia in the state's former capital.

Switzerland's oldest public observatory is an important part of the Zurich cityscape.

A neglected spomenik overlooking the beautiful Kopaonik Mountains.

An unfinished Serbian Orthodox church with 1,389 golden crosses planned to represent the Battle of Kosovo.

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

This memorial to a murdered empress took 20 years to design, then spent 30 years hidden away in storage.

A Soviet era flat that refused to conform to the dull gray standards.

A mechanical clock built in 1914, with a rotation of 12 historical figures on its face.

Dedicated to the outnumbered Finnish forces who pushed back Soviet forces during the conflict.

Memorial to the victims of the Holocaust in Serbia.

These 400-year-old ruins are all that's left of the monastery where Ines de Castro was assassinated by the King of Portugal.

This metro station doubles as an unintentional paleontology museum.

Also known as Uncle Karl, the beloved bronze copper keeps a watchful eye on St. Stephen’s Basilica while people rub his lucky belly.

Krakow's own version of the Hollywood Walk of Fame.

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.