An abandoned NSA listening post on Berlin's "Devil's Mountain."

A narrow passage next to a cafe leads to a courtyard exploding with murals, tags, and paste-ups.

The largest free-standing aquarium in the world resides in a hotel lobby in Berlin.

Unconventional site where the tracks of Zurich tramcars intersect.

Zurich's evolution museum hosts a unique collection of skeletons among its natural history treasures.

In memory of The Blur Building, the temporary exhibition pavilion of vaporous nothingness.

Natural history museum displaying a famous taxidermied St. Bernard.

A once-thriving hotel in the Swiss Alps couldn't compete with climate change.

A modern reimagining of a medieval city gate.

Built by crowdsourcing, this wooden foot bridge saved a part of Rotterdam that was languishing in wait of city funding.

Europe's official "zero-level," the equator of elevation.

The last of Amsterdam's original sea level markers remaining in place.

This museum housed in a former brothel explores the past and present of sex work in Amsterdam.

Debatably clever, or just plain honest hotel advertised as "The Worst Hotel in the World."