Fragments of human bones are embedded in the walls of this quaint alley.

A strange anthropomorphic stele with a mysterious inscription that has never been deciphered.

An out-of-place grove of sequoias thrives in northern Spain.

Climb a steep hill in 90 seconds on the second-oldest urban subway in the world.

One of Europe's largest groups of dolmens remains largely off the typical tourist track.

Climb to the top of its spiral spire for spectacular views of Copenhagen.

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

The ancient heart of Tunis is an enormous maze of narrow streets and alleyways.

This small Spanish village is home to dozens of public paintings meant to trick the eye.

This grisly exhibit houses skeletons and weapons from a devastating 14th-century clash.

An abandoned anti-smuggling station decays along the boundary between Portugal and Spain.

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

This colorful statue welcomes visitors to a Barcelona park.

An "evil painter" included pointed symbols in this artwork to poke fun at members of the Danish Parliament.

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

The gilded, masterful astronomical clock will calculate time, dates, and planetary positions for thousands of years to come.

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

This ordinary street was made infamous by a legendary visit from the devil.

This centuries-old rooster survived a devastating fire.

A heated statue pays tribute to one of Sweden's great actresses.

A wooden street sign is the last remnant of this 400-year-old alleyway.

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

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

Hans Christian Andersen for the postmodern world.