A series of modernist treehouse hotel rooms grace the outskirts of an Arctic forest.

A museum filled with tiny, adorable versions of the mighty Royal Danish Navy.

The last Viking king of Denmark is buried inside the crypt of this cathedral.

This striking royal residence is the largest Renaissance-style castle in Scandinavia.

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

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

A perfectly circular stronghold constructed in the 10th century is now a nucleus of Viking culture housing a museum, village, and reenactment of an epic Viking battle.

Museum on earth sciences featuring a recreation of a famous curiosity cabinet.

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

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

Old Danish castle immortalized in Shakespeare's Hamlet.

Opulence and fantasy collide in this royal chair which is supposedly made with unicorn horns.

This secret collection of the strange and occult was rediscovered in a forgotten room of an old house.

Hans Christian Andersen for the postmodern world.

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

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

Dine on food tied to Viking history and legend at this subterranean Stockholm spot.

The world's first ice hotel is still one of the most elaborate and beautiful.

One of the greatest maze designer’s greatest mazes.

The oldest stone house in Paris was built by its most famous alchemist.

The collection of signage remembers the midcentury pushback against the new neon light.

The one-stop shop for all of your superhero (or evil arch-nemesis) needs.

The oldest operational cathedral in the U.S. has one shell of a way of projecting speakers' voices.

The state's oldest continuously operating museum houses more than 5,000 Civil War artifacts.