1898 German railroad depot museum with working engines, steam train excursions, and hands-on displays.

This East German military command bunker was ready for World War III.

Between Neo-Pagans and Neo-Nazis, these strange rock formations have a curious cult following and a very strange history.

Striking occult iconography on a medieval German church.

A haunting collection of the vanished and disappearing natural world.

A surrealist timepiece by the artist of melting clocks.

Explore the History & Technology of Electronic Communication

14th century Norse artifacts in Northwestern Minnesota could have proved a Viking landing before Columbus.

An abandoned saucer-shaped monument in the Bulgarian mountains.

The legendary cliffside castle of three-time Voivode of Wallachia, Vlad the Impaler.

Space-age monument to an early 20th-century uprising.

On top of a resort town as old as the Bronze Age sits an incredible war memorial statue overlooking the beaches below.

Structure built from the skulls of vanquished foes.

A Red Cross memorial museum at the site of the Niš concentration camp that operated for four eventful years during World War II.

This memorial park stands on the site of one of the largest mass executions of the Second World War.

A war-torn Olympic relic is being overtaken by graffiti and nature.

This museum preserves the hand-dug tunnel that kept Sarajevo afloat during the Serbian siege.

Legendary prop shop filled with one man's collection of scientific curiosities.

Standing in a state of "arrested decay," this ghost town allows for a detailed peek into Gold Rush life in an unusually harsh climate.

Climb inside an iron crystal magnified 165 billion times its normal size.

The bizarre visions of H.R. Giger, tucked away in a Swiss medieval city.

The remains of three Luftwaffe launch pads designed for manned anti-aircraft missiles.

The place where World War I began.

Odd outsider art installations surround a Gold Rush-era ghost town.