The oldest stone house in Paris was built by its most famous alchemist.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

A statue in Budapest's Liberty Square honors the former U.S. president's efforts to end the Cold War.

A museum dedicated to a secret military hospital hidden beneath a castle in Budapest.

Budapest's Communist-era statues, banished to the suburbs.

A Hungarian pharmacy museum with a box full of mummy powder.

From Austrians to Nazis to Soviets, this historic Budapest fortress has a history as complex as the city itself.

A museum in the childhood house of a medical pioneer.

Built in 1870 at the bridge that connected Buda and Pest, this spectacular incline railway was almost lost forever during World War II.

Once the home of a hermetic monk, this cave now houses a small church.

Pre-Nazi swastikas adorn the sculpted pachyderms flanking this brewhouse portal.

Copenhagen's celebrated theme park and gardens.

Home to 200 plaster casts of Scandinavian proboscises.

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

The world's tallest boat lift stands as a massive piece of industrial tourism.

A natural wonder in south Denmark.

A tribute to the Polish insurgents who fought in the failed attempt to end their city's Nazi occupation.

Hans Christian Andersen for the postmodern world.

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

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

A modern, secular take on a traditional Virgin Mary motif.

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

Swedish skyscraper with a 90° twist.

This doorless 20th-century elevator doesn't stop or slow down.