London's smallest police station is barely the size of a phone booth.

Several plaster noses are hidden in plain sight around London's Soho neighborhood.

Home to Alan Turing, the cracking of the Enigma code, and Captain Ridley's shooting party.

Oxford University's stateliest library seems designed to make students truly feel the weight of knowledge.

142 ceramic steps become a mosaic once a year.

The dome-shaped reservoir of this old water tower produces unique acoustic effects.

Only electricity pylons carrying both AC and DC circuits.

One man's fascination with Turkey led to this backyard mini-city.

This Stockholm light tower can be controlled by anyone with a smartphone.

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

Now a hotel, this former bank was the site of a robbery that spawned a psychological phenomenon.

Unusual building appears to be haphazardly built from randomly piled bricks.

An entertainment center in a huge transparent tent.

Church built on the site where the last tsar of Russia and his family were killed.

Mostly underground in the old days Back in the USSR, today the Beatles beckon to tourists from a wall sculpture out in the open in central Russia.

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

Home to 200 plaster casts of Scandinavian proboscises.

20-foot tall lamp mumbles Swedish to celebrate the holidays.

Swedish skyscraper with a 90° twist.

Vortex-shaped aquarium hosts Europe's largest school of piranhas and other ocean creatures.

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

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.

An old Danish political institution where members of government can grab a drink off the record.