Vienna's diversity-themed traffic lights were inspired by the Eurovision Song Contest.

A neo-Gothic mansion now houses a wunderkammer of analog tech that hits on all the senses.

A silly medieval mural preserved on the side of a Viennese house.

A spherical "micro-nation" in the heart of Vienna.

Built to give thanks for the passing of a plague epidemic, this cathedral is a one-of-a-kind architectural hybrid.

The topiary maze at the Habsburg hunting lodge.

Medical museum that houses most notably the taxidermied remains of Vladimir Demikhov's famous two-headed dog experiment.

Latvia's symbolic mountain-shaped national library is home to millions of cultural tomes.

A black cat protests the City Guild in Riga's Old Town.

The largest art park on the European continent.

The laboratory where the Soviet secret police invented exotic poisons used to kill dissidents in hideous and (mostly) untraceable ways.

An art museum inside an active factory.

Intricate wood carvings on an island in Siberia.

A replica of the straw hut where Vladimir Lenin lived in hiding, disguised as a hay farmer, in 1917.

A small and surprising passageway in Saint Petersburg devoted to the Beatles.

A surreal pile of colorful junk fills a small yard in an otherwise gray neighborhood.

An unusual collection of self-made musical instruments and unique noises.

The Nazis lost more men trying to take this Russian-held Stalingrad apartment block than they did when taking Paris.

This iconic Russian space museum sits on a landmark space production facility and houses the Vostok 1, the first manned spacecraft, that was also built here.

A city block packed with whimsical sculptures that seem to be plucked from a tiled fantasy world.

A scale model of Russia so big visitors are offered binoculars to rent so they can see the whole thing.

This Russian museum stresses the importance of keeping clean and even holds one of Pavlov's dogs.

Museum design and public transportation meet in this unique Russian train car.

A Marxist summer camp full of fantastical statues lies tucked away and forgotten in the forests of Moscow.