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

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

The world’s first museum dedicated to the history of childhood opened in Edinburgh in 1955.

360° views of the city plus five floors of optical illusions and hands-on science.

Dress up like a miner and take a slide into the disco-lit depths of this once foundational salt mine.

The last bastion of Roman presence north of the Alps looms over a German town.

Thousands of flowers create enchanting pink tunnels over the city streets.

A memorial for a young woman and her ghost, which are claimed to have caused countless deathly shipwrecks.

This medieval castle overlooking the Elzbach river looks just like it did hundreds of years ago.

Thousands of tourists and residents in Cologne affix "love padlocks" on the Hohenzollernbrücke Bridge to symbolize their affections.

People have been living in the cave houses on this Italian hillside since the Neolithic era.

Roughly 17 million letters to Santa have found their way to this Arctic Circle post office.

If you visit Santa's village, you can get your passport stamped to show you crossed into the Arctic Circle.

A subterranean house of worship carved right out of the bedrock.

This irregularly shaped sea fortress has defended not one but three different sovereign states.

The prototype for all Nazi concentration camps.

Daily jousts and dancing barrel makers in Munich's mechanical clock.

A ruined castle stands atop a hill surrounded by dragon lore.

This massive steel pyramid can be entered by a set of jagged steps that let visitors stand in its heart.

A little sculpture with a large wardrobe.

This temple to the sturm and drang of Richard Wagner contains a dragon's cave and reptile zoo full of living "dragons."

The silly symbol for an underground protest group is now scattered around the city.

An old department store turned Nazi prison turned artist commune.

A statue honors the local legend that the devil helped build St. Mary's church after being tricked into thinking it was going to be a wine bar.