Water mills built into a cave in the 17th century are powered by a subterranean river.

Swedish skyscraper with a 90° twist.

This poignant sculpture of a gnarled weapon is a symbol of non-violence.

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

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

God's Saharan sandbox of wrath.

Morocco's Argania trees are infested with nut-hungry goats.

This iconic 1,000-year-old medieval castle is a favorite of the film industry, most notably as the location for Hogwarts in Harry Potter.

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

The gloomy ruins that inspired Bram Stoker to bring Dracula to life.

Copenhagen's celebrated theme park and gardens.

Now famous as the "Harry Potter bridge," this impressive concrete viaduct has long been an icon in its own right.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

Walk underneath a railway bridge over the river Reuss with just a metal grating under your feet.

At the very tippity-top of Europe is a cliff from which you can view the midnight sun.

This functioning parish church is also the site of many concert performances due to its wonderful acoustics.

World's strongest whirlpool.

A serpentine highway twists and turns over the treacherous Norwegian Sea.

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

The castle was reconstructed to fit Kaiser Wilhelm II's romanticized vision of the Middle Ages.

A breathtakingly steep set of stairs is carved directly into the face of the sea cliffs of Bonifacio.

Napoleon's childhood home is now open for people to explore the beginnings of France's short general.

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

A beautiful ruin of a 14th-century Plantagenet castle built by a medieval mercenary.