Copenhagen's celebrated theme park and gardens.

It houses the remains of a 17th-century version of the Titanic.

This statue and park honor the Swedish chemist Jacob Berzelius, one of the founders of modern chemistry.

It is said that each of the white stones in the red facade of this medieval house represents the head of a murdered Swedish noble.

Stockholm's narrowest alley is barely over two feet wide.

Now an entertainment complex, the Lingotto building was once an avant-garde auto factory with a test track on the roof.

Two very green residential towers cleaning the air in one of Europe's most polluted cities.

This "floating railway" is one of the world's oldest monorail systems.

Hamburgers are intensely proud of their tunnel beneath the river.

Model Trains and Much More in Hamburg.

A monument to the three wars that led to German unification towers within a Berlin traffic circle.

Where once there was a train station bathroom, there is now this German burger joint.

The world's largest reflecting pool is just two centimeters deep.

Bordered by forest on three sides and the ocean on the other, the Great Dune of Pilat is the highest sand dune in Europe.

Regency-era excess on the English Coast.

The rotting skeleton of a shoreside fun fair that was destroyed by fire and storms still haunts the Brighton ocean view.

The location of this historic castle was inspired by a donkey.

This Scottish castle has witnessed clan rivalries, Jacobite uprisings, whisky smuggling, and more.

An 18th-century lighthouse built on a 16th-century castle is now a monument to the maritime beacons of Scotland.

These ruins are a hidden gem, complete with fantastic views over the cliff edge.

This enchanting Victorian estate was home to the world's first hydroelectric power generator.

A perfectly running 230-year-old silver automaton and music box.

A locomotive made from 185,000 bricks celebrates the town's pioneering railway history.

This medieval manor house was hastily fortified when it found itself in the middle of the Scottish fight for independence.