Places KarlPopper Wants to Go

In northeastern Poland, the ruins of a massive granary overlook the Narew River.

A symbolic cemetery in a suburban square marks the birthplace of Poland's WWII resistance movement.

A national collection of Communist-era musical posters.

This alluring underground library, hidden in a suburban Metro station, features a Space Age aesthetic and its own hydroponic garden.

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

A program of Communist glamour in post-Stalin Poland is preserved in this colorful museum.

A hidden art gallery in an abandoned Warsaw fort.

One of the world's largest collections of medieval religious art.

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

A heavily politicized roundabout discussing the state of a heavily politicized country.

Warsaw's fantastically preserved gasworks...almost.

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

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

Once built to inspire young Soviet minds through astronomy, this dome now stands as a quiet relic of a vanished era.

A statue dedicated to the founders of communism.

Once the tallest building in Chisinau, this unique tower is a relic of Soviet architecture.

This abandoned Soviet circus is slowly being restored to its Communist-era glory.

The final resting place of one of the first alleged vampires.

A hidden, morbidly fascinating cemetery deep in the forest.

The skeletal frame of a decommissioned gas-pumping station offers breathtaking views of greater Berlin.

This conical hill was built as a testing ground for an engineer known as the Glider King.

A unique Holocaust memorial tells the personal stories of the Jewish residents exiled from greater Berlin.

Berlin's oldest surviving academic architecture hosted decades of animal dissections.

One man's remarkable private collection of art from around the world.