A magnificent, glittering building tucked into a tiny Bulgarian mountain town.

A striking symbol of the Bulgarian capital.

Sofia's legislative center is continuously reinventing itself.

This sprawling concrete suburb of Kraków was designed by the Soviet Union as the model proletarian city.

This chimerical bridge/tunnel appears to dead end right into the sea.

Old Danish castle immortalized in Shakespeare's Hamlet.

This Swedish astronomical clock was in storage for almost a century before its glorious workings were put on display once more.

Swedish skyscraper with a 90° twist.

The de facto symbol of Copenhagen is this bronze fairytale which cannot seem to keep its head for very long.

Danish tourist destination well known for open stalls where vendors sell marijuana on the street.

The old observatory in Copenhagen has a spiral corridor used as a racetrack.

Copenhagen's celebrated theme park and gardens.

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

Tucked away in a Prague park, a statue beloved by romantics honors a poet so nice they buried him twice.

Vienna's giant wonder wheel had a starring role in one of the greatest noir movies of all time.

For over 40 years, this quaint little house has teetered on a rock in the middle of a river.

Museum celebrating the ocean, with the largest wunderkammer dedicated to sea exploration.

Romania's triumphal arch looks out over Bucharest.

This private skyway is filled with art and was expanded explicitly so that Hitler could appreciate a river.

An abandoned saucer-shaped monument in the Bulgarian mountains.

This ancient theater, restored in the 20th century, lives on as a venue for dramatic and musical performances.

A solar-powered primary school inspires hope and experimentation in a country ripe for energy innovation.

This architecturally eclectic early-20th century mosque was built as a place of worship for the Islamic followers of a Jewish messiah.

The hallucinogenic center of the ancient world.