Once home to some 250,000 volumes and priceless art artifacts, this Polish estate was a target of bombing during World War II.

Ruins of a late 1950s Polish ski jump ramp in the middle of the city.

These plaques found across Warsaw commemorate the sites where executions or battles took place during the German occupation.

A bronze replica of an elm tree that honors the victims that perished in Pawaik Prison.

This colorful and quirky set of pegasus sculptures celebrate the works of poet Zbigniew Herbert.

The final resting place of the last "gypsy king" of Poland.

This bell stars in a tragic love tale and is said to make wishes come true.

Special benches that play Chopin's music are scattered throughout his native city.

A tree planted by Marie Curie is treasured by the Radium institute that she set up.

Legend says this is actually a heartbroken prince waiting for his true love's kiss.

The giant statue and its model solar system honor the native Pole who declared that the Earth revolves around the Sun.

The Polish capital has had a deep connection to its guardian mermaid for almost a millennium now.

The final resting place of more than 200,000 people, this is one of the largest cemeteries in Europe.

This hidden collection of everyday objects illustrates life within communist Poland.

A statue honors the children who fought Nazis in Poland.

Warsaw's fantastically preserved gasworks...almost.

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

A 300-kilogram egg sculpture that embodied a neighborhood revival.

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

These traffic lights celebrate the 100 year anniversary of the women's suffrage movement in Lithuania.

An abandoned masterpiece of Soviet Brutalist architecture.

This micro-nation may be some sort of prank, but its constitution sure seems official.

A secluded art gallery hidden within the cellars beneath Tallinn’s medieval monastery.

An underground nightclub helped spark a "Singing Revolution."