Down this Cracovian street resides a plaque with a stark message about the city's air pollution.

An underground city beneath Krakow's postwar socialist utopia.

A memorial to the beloved brown bear that served in the Polish army during World War II.

This man-made mound monument was built out of soil from all across the Polish empire.

This statue is dedicated to the animal cosmonauts that perished during space flight experiments.

A Latvian rescuer who saved countless lives during World War II.

A monument to the grand synagogue that stood in this space before Nazis burned it down.

This underground transport hub doubles as an art gallery.

At this rare mosque in Tbilisi, Sunni and Shia Muslims pray side by side.

This extraordinary, multi-pillared monument depicts the fascinating history of Georgia.

Luxury hotel turned into a refugee camp, then turned back into a luxury hotel.

A small but hugely whimsical theater where marionettes play out the "The Battle of Stalingrad."

The last standing example of an ancient district's teatime tradition.

Unusual building appears to be haphazardly built from randomly piled bricks.

A cluster of historic bathhouses built on the famed hot springs that gave the Georgian capital its name.

You'll find just about anything in this funky Tbilisi flea market.

The charmingly disheveled clock tower of Tbilisi's puppet theater.

Rubbing the buttons along this statue's coat is considered good luck.

A spectacular Petrine Baroque summer palace commissioned for Catherine I by Peter the Great.

This 16th-century cemetery became a recreational park during the Soviet occupation—today it's a little bit of both.

A miraculous three-handed portrait of a saint can be found inside this church.

Plaques celebrating Lithuanian writers freckle a wall of this picture-perfect path.

A century-old prison in the heart of Vilnius is now a lively bar, dance club, and artist residency.

While this monument tile is shrouded in mystery it also marks the end of the longest ever human chain.