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

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

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

Communism's topsy-turvy effect on Poland has been brought to life in this wacky tourist trap.

Warsaw's fantastically preserved gasworks...almost.

Naturally formed rock city in Poland.

The site of the first battle of World War II.

This uber-quaint Polish village is known for its habit of painting elaborate floral motifs on just about everything.

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

A fairytale Gothic castle steeped in Nazi treasure conspiracy theories.

The former Nazi concentration camp stands as a museum to remember this dark chapter in European history.

Real bones which are said to have belonged to a Polish dragon.

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

An underground city of salt.

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

Amazing meticulous gardens of personal wood carvings, Hydrangea, Canna, and many other flowers.

Half of a house.

San Franciscans leave gifts and messages for the magical beings that live behind the tiny, mysterious door installed on a tree in Golden Gate Park.

With the touch of a button, you can read a randomly selected short story.

An overlooked and unassuming engineering marvel.

This concrete tangle of square pipes has stood as a proud thorn in the city's side since the '70s.

The remains of a ruined mansion memorialize the 1906 earthquake.

A 300-ship graveyard, with a few still visible at low tide.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.