An ancient instrument used to measure the waters of the Nile so Egyptian farmers would know whether to expect famine or flood.

Natural time capsule containing an alien ecosystem.

Brightly painted boulders scattered throughout the Sinai Desert.

A massive work of modern art that appears to be a crop circle in the middle of the desert.

One of the best examples of Art Deco architecture in the United States.

This cubist Vienna church building looks like some sort of alien stonehenge.

Egyptian Revival movie palace abandoned for decades and restored in 2013.

A 16th-century horror show built in a lovely Italian garden.

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

A stunning cemetery famous for its extraordinarily delicate & lifelike mourning sculptures.

Steaming blood-red hot spring from hell.

The Natural History Museum that time forgot.

A giant portrait of an ancient king looms over the river.

Hidden behind a wall for decades, this masonic lodge was only rediscovered during renovations.

An abandoned saucer-shaped monument in the Bulgarian mountains.

Mysterious concrete spires left on a small Canadian hill.

This huge metal monument is slowly being stripped to its concrete skeleton.

Croatia's towering concrete blossom grows from the site of a World War II concentration camp.

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

Serbia's master of striking memorials erected a forgotten, hidden gem in the hills outside a tiny village.

Built as an anti-fascist tribute, this surreal Yugoslav memorial became an unwelcome symbol after the Croatian war for independence.

An abandoned monument remembering the "Pančevo Holocaust" now stands as a shadow of its former self.

A tower marking the spot where Yugoslavia began its resistance against the invading Nazis stands neglected, but not quite forgotten.

This brutalist monument is inscribed with 9921 names of Yugoslav partisans who perished during WWII.