The jaw of one of humankind's earliest ancestors on display at an overlooked geology museum.

Sitting in the basement of a castle, the largest wine barrel in the world is bigger than most apartments.

A collection of artworks exclusively created by the mentally ill that was almost burned by Nazi culture police.

This World War II bunker now survives as a documentation of the Nazi regime and war crimes.

The most visited, and possibly most controversial, museum in Germany.

This artificial cave looks like something out of a fairytale.

This doorless 20th-century elevator doesn't stop or slow down.

A bust of Franz Kafka spins in pieces, reflecting the writer's inner torment.

The risqué mixed-media sculptures are supposedly a metaphor for Czech politics.

Two stunning 17th-century libraries and a cabinet of curiosities.

Macabre astrological automaton clock dating to the late 1400s.

Learn the fine art of making a centuries-old treat at this hands-on food museum.

Inside this Krakow church, an explosion of psychedelic color.

Poland's oldest surviving university building holds a wealth of historic science instruments including some used by Copernicus.

Atop this library is one of the most beautiful green spaces in Warsaw.

This extensive collection covers thousands of years of Polish military history.

Order “Proletariat’s Cutlet” at this communist-themed restaurant allegedly once visited by Lenin.

A 20th-century picture show in 3-D.

At night, this memorial illuminates a ghostly outline of a footbridge that connected two sections of the Warsaw Ghetto.

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

Warsaw's fantastically preserved gasworks...almost.

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

The palace for King Gustav III was never completed, but the foundation remains tucked away in this city park.

Twice a year, this floating library delivers thousands of books to the remote islands of Stockholm’s archipelago.