A hidden bathhouse in one of Stockholm's oldest and busiest neighborhoods is open to anyone who can find it.

Sweden's first nuclear reactor, R1, can be visited 25 meters underground.

Stockholm's decidedly unique public transit system has doubled as the world's longest art gallery for decades.

A novel collection of medical curiosities housed in an 18th-century surgeon training academy.

Bored potato-guarding Nazis etched their thoughts onto a brick storage building in Copenhagen's Meatpacking District.

A little-known cafe in an old copper bridge tower with 360-degree views of the harbor.

A collection of noses tucked inside an art museum reveals how times have changed.

The largest bottled beer collection in the world holds over 22,000 unique beer bottles.

Beneath Denmark's Højbro bridge, a bronze merman and his seven sons forever mourn for the mother and wife who left them for land.

Hans Christian Andersen for the postmodern world.

This sublime architectural marvel is a rare example of an expressionist church.

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

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

An ultra-modern diversity park in Denmark has turned an entire city block electric pink.

Copenhagen's celebrated theme park and gardens.

A marvel of Byzantine engineering under the streets of Istanbul.

A meow-velous tribute to a beloved street cat, made famous on the internet.

New York City's only wildlife rehabilitation center treats more than 3,000 feathered and furry patients each year.

The most unloved grain elevator in Brooklyn was a “Magnificent Mistake.”

Feral cats keeping the rodent population at bay all across Greenpoint waterfront.

A collection of fanzines, recordings, and documents detailing the rise and influence of the feminist punk movement.

This outdoor gallery of graffiti-covered walls pays homage to the past, present, and possible future of street art.

Come for the sustainable organic chocolate, stay for the sustainable organic booze.

One of the last full-orchestra recording studios in New York City and an acoustical marvel.