Open-air museum with a large collection of Soviet-era statues.

This monument commemorates the soldiers who fought for 16 hours straight to penetrate this concrete fort.

A small part of Russia that does not touch any other part of Russia.

An impressive ensemble of sculptures that survived the Soviet regime.

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

This now-defunct synthetic fuel plant was once a major cog in the Nazi war machine.

On this Polish road, an optical illusion makes cars seem to roll uphill.

This hilltop ruin is of the hundreds of stone columns built in tribute to the first German chancellor.

A World War II torpedo launch station abandoned off the Polish coast.

Boats must transform into railroad cars to navigate this Polish canal.

These massive moving sand dunes have swallowed an entire village and are still on the run.

A tribute to the Polish insurgents who fought in the failed attempt to end their city's Nazi occupation.

Countless stories attempt to explain Poland's mysterious J-shaped trees.

The walls and ceiling of this Polish church are decorated with thousands of skulls, with another 21,000 skeletons just below.

Hidden deep in a forest is this geological wonder carved by glaciers.

The recreated ruins of a house designed to memorialize a World War I shelling on the town.

A local remembrance for lives lost—a poppy for each—in war more than 100 years ago.

Fortifications built for a Soviet invasion that never came now sit abandoned in a losing battle against nature.

The first European statue dedicated to the legendary musician.

This magnificent white pagoda was constructed to resemble a sacred Buddhist mountain.

This Cold War–era fallout shelter was actually a storage facility for the nation's emergency currency.

An unexpected ghost village lurks on the southeast coast of Tenerife.

Countless grotesque faces stare out from this eerie Prague art wall.

This former quarry is now a picturesque gorge that hides a sunken lake.