The soulless eyes of 82 bronze children stare on forever in remembrance of a horrifying World War II massacre.

This charming wooden church was disassembled and moved not once but twice before settling in this Prague garden.

An old asylum graveyard that's been abandoned for half a century attracts those seeking a dark thrill.

When the river dries up, these stones start talking.

The hollow trunk of this 650-year-old tree was used as a hideout by two Jewish brothers during World War II.

A line of disused military bunkers built to defend against Nazi invasion lies hidden on the outskirts of the city.

An underground city of salt.

Beneath Kraków Old Town's main square lies a hologram-filled medieval market vampire graveyard wonderland.

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

This Nazi ruin was the site where Hitler was almost blown up by a suitcase bomb.

The site of the first battle of World War II.

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

Warsaw's fantastically preserved gasworks...almost.

The unsettling remnants of a torn down movie set lies nearby the ruined location of the actual Płaszów Labor Camp.

This 700-year-old structure is one of the most unique architectural and historic monuments in Gdańsk.

Naturally formed rock city in Poland.

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

An abandoned Nazi explosives plant founded by the inventor of dynamite is now an underground museum.

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

Crosses of all shapes, sizes and colors litter the mountain, the site of a huge yearly Orthodox pilgrimage.

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

Museum dedicated to "the man who moved the Earth."

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

This fairytale inspired, warped building houses restaurants, shops, and a radio station.