A beautiful little museum hidden away in the heart of Barcelona holds a treasure trove of Ancient Egyptian artifacts

This home designed for chocolate magnate Antoni Amatller is an exquisite treasure-box of Catalan Modernism.

The largest Art Nouveau complex in the world is a Barcelona hospital with a 600-year-long history.

An early 20th-century bullring converted into a modern shopping center.

This colorful statue welcomes visitors to a Barcelona park.

A former steam-powered mill from the 1800s is now an industrial park with a giant steel dragon slide.

A mammoth WWII anti-air defense tower has been repurposed as a hotel with a rooftop garden.

This graffitied 19th-century building was a prototype of European industrial architecture.

With a design inspired by traditional Latvian textiles, this monument honors the Latvian people who suffered under Soviet occupation.

A collection of historical engines and rolling stock from throughout Riga's rich railway history.

Medical museum that houses most notably the taxidermied remains of Vladimir Demikhov's famous two-headed dog experiment.

Egyptian treasure trove of fossils documenting the whale's transition from land mammal to sea creature.

An alien landscape of chalk-rock in the Egyptian desert.

Slum Settlement Filled With Mountains of Garbage.

The medieval center of the Islamic world was also once the seat of Saladin's sultanate.

Standing atop 2nd-century Roman ruins, this church is one of the oldest and most iconic in Old Cairo.

The massive cave church of Cairo's Zabbaleen community is one of the largest Christian churches in the Middle East.

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

Proof of ancient aliens, or simply a creative way for farm laborers to clear their fields?

A vista of the city and sea from atop the little-known viewing deck on an unassuming Columbus statue.

Hidden in the garden of physicist Erwin Schrödinger's house is a life-size figure of a cat from his famous thought experiment.

Featuring a meatless buffet fit for kings, this family-owned Zurich eatery is considered the oldest vegetarian restaurant in the West.

One hundred years ago this small house in downtown Zürich became the birthplace of the Dada movement.

A 200-year-old tavern challenges guests to finish a glass of wine while hanging from a ceiling beam.