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

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

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.

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

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

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

A delightful museum entirely dedicated to the tiny homes of dolls.

This biographical museum honors the groundbreaking scientist at her birthplace in Warsaw.

The site of the first battle of World War II.