In the woods of New Jersey lie the ruins of a munitions village abandoned after World War I and the remnants of a 1920s wooden racetrack.

Remnants from a time before electricity.

These conical kilns measure an impressive 30 feet in diameter, and were once used to produce charcoal for a local blast furnace.

An abandoned asylum once on the cutting edge of lobotomies may be reborn as a Christian college.

The East Village tenement from the cover of Led Zeppelin’s 1975 album has a tea shop on the ground floor.

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

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

The majority of the highest mountain in Poland is actually located in a different country.

A somber memorial honors the hundreds of thousands of lives lost at this labor and extermination camp.

Built to transport German U-boats through the never-completed Masurian Canal, the locks near this Polish village are now home to a rope course.

Gliwice Radio Tower, likely the tallest wooden structure in the world.

People in Poland have rallied to save this unnatural desert from being reclaimed by the forest.

The oldest wind turbine in Europe, constructed by a group of friends in 1932.

A stone in Wolin, Poland, marks the possible location of a legendary Viking fortress.

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

The two abandoned overpasses are among the largest bridges in Poland.

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

An abandoned football stadium with a tragic past.

A small granite monument marks where the borders of three countries meet.

Dubbed "Wistom" by locals, this abandoned factory is an urban explorer's dream.

This Communist-era residential block is one of the longest residential building in Europe.

One of only two places in the world where two rivers cross each other without the waters mixing.

This picturesque castle in Poland has a rich history, including a legend that ties it to lost Incan treasures.

This tower in a small Polish village uses the power of a sacred bell to ward off mischievous weather spirits.