Mounds, rune stones, and a 1,000-year-old church, left behind by Denmark's first two kings.

An air of mystery pervades this modern-day singing Stonehenge.

The shiny silver little brother to Copenhagen's Little Mermaid statue.

A symbol for the opposition to nuclear power around the world.

The final resting place of one of the brightest physicists of the 20th century.

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

Denmark’s never-ending bridge.

Old Danish castle immortalized in Shakespeare's Hamlet.

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

A natural wonder in south Denmark.

The 20-mile causeway that separates the Netherlands from the sea.

A luxury hotel housed in a former 15th century Gothic church.

A miniature city, once ruled by the Queen of the Netherlands.

Go inside a revolutionary, cage-less zoo where 35 species live and some of them roam free alongside their human visitors.

A maze of crosses marks the jumbled divide between the Netherlands and Belgium.

A little sculpture with a large wardrobe.

From Tintin to the Smurfs, Europe's greatest graphic icons are celebrated in a grand Art Noveau gallery.

This fairytale castle was built as a show of power but was nearly torn down thanks to its history of torture.

The remains of a majestic house that was once stood in the crosshairs of the Irish Republican Army.

The ruins of a medieval monastery named after a type of tree.

A retired military stronghold on the rolling green coast of Donegal.

A stunning Victorian abbey and walled garden on a lakefront.

A strange egg in a mucky bog of western Ireland marks the spot of an aviation milestone.

Traveling this mountain pass reveals quaint stone buildings, stunning Irish scenery, and a bridge said to grant wishes.