Red sandstone structures dominate this landscape, which has been inhabited for some 5,000 years.

If you look closely at the oldest bridge in Paris, you might notice hundreds of ugly faces leering from its sides.

The final resting place of the author who gave us the Little Mermaid, the Ugly Duckling, and many more beloved fairy tales.

Once a meeting point for great thinkers, and the midpoint of the country.

An architectural oddity where the triglyphs of the courtyard of walls create an optical illusion.

One of the last remaining railway viaducts equipped with a transporter ferry.

The painter of "The Scream" is laid to rest under a stoic bust of himself in the humble corner of an Oslo cemetery.

The design of this beautifully crafted building was inspired by Norwegian glaciers.

A favorite with sightseers and locals alike, this Norwegian funicular provides easy access to a stunning view of Bergen and its environs.

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

Swedish skyscraper with a 90° twist.

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

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

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

Old Danish castle immortalized in Shakespeare's Hamlet.

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

Copenhagen's celebrated theme park and gardens.

A gorgeous example of 13th-century Gothic architecture.

A 14th-century abbey founded by a forest-loving order of monks now sits in the center of a pristine nature preserve.

This church on a Tohono O'Odham reservation has stood since 1797.

An impressive bridge over a ravine also served as an aqueduct.

The second-highest train station in Europe.

The site where a plot to assassinate Hitler was planned—and its conspirators were executed—is now a powerful memorial to the German resistance during World War II.

A defensive structure built during the Hundred Years War has remained useful in one way or another for nearly 700 years.