This ruined fortress was the stronghold for a persecuted medieval leader and his infamous Assassins.

The trailblazing Swedish businesswoman created a beloved minty candy called polkagris.

A cylinder monument with a spectacular vista commemorates a friendship that some say never existed.

This Soviet-era "closed town" was a top secret uranium producer often left off of maps.

An abandoned textile factory on the "island of crows" was home to Estonia's first workers' strike.

This Gothic church was wheeled in its entirety to a new location a half a mile away.

Look closely and you’ll notice that the color changes a third of the way up the tower.

An unfinished complex built for children from around the world sits abandoned on the Black Sea coastline.

An abandoned outdoor movie theater in the Sinai desert.

A unique hotel for the artistic soul.

An eclectic art form practiced by untrained masters is celebrated at this museum in the heart of Zagreb's old Upper Town.

"There's nothing there," and other lies the KGB told us.

A curious art park at the geographic center of Europe is home to 3,000 television sets and other wonders.

The hidden lair of an alchemist rediscovered in a 2002 flood.

This disappearing geyser has been attributed to witchcraft, but really it's all about rainfall.

This abandoned secret city is a crumbling wonderland of Soviet ruins.

Over 300 wood sculptures depicting characters from Slavic, Greek and Western folk tales fill this magical garden.

This Russian religious complex is a Frankenstein's chapel that includes influence from almost all the major faiths.

This mountaintop observatory is home to one of the world's largest reflective telescopes.

A vast and unlikely aviation museum kept alive for over 50 years due to one man's tenacity.

This network of conjoined cellars was riddled with traps and supposedly allowed the townspeople to pretend their homes were deserted.

This soviet pilot's graveyard is filled with headstones made of airplane fins.

An eccentric artist's abode in this small Italian town has been transformed into a surreal temple of mosaic madness.

A giant gorilla made of used car tires used to sit sentinel over a Helsinki college campus.