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

This ultra-modern wooden boardwalk turns the ocean into a swimming pool.

The original home of the Lego has a huge amusement park dedicated to the iconic plastic toy.

A daring D-Day assault by U.S. Army Rangers is commemorated atop the high cliffs of this strategic point.

A memorial to the nearly 10,000 American soldiers laid to rest on the beaches of Normandy during WWII.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

Remains of the artificial harbours invented for the Allied invasion of Normandy can still be seen at sea.

This enormous "cloth of the conquest" depicts the Norman invasion of England in mind-blowing detail.

Holy Grotto of Montserrat Monastery holds one of Europe's mysterious black Madonnas.

Designed by Gustave Eiffel before his famed tower.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

The largest Art Nouveau complex in the world is a Barcelona hospital with a 600-year-long history.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

The iconic boulevard is the perfect place to catch sight of a bicycling skeleton, a levitating Satan, or a chef with his head stuck in a pizza.

A vista of the city and sea from atop the little-known viewing deck on an unassuming Columbus statue.

Monument to a suicide protesting the Soviet invasion.

Synagogue built from the stones of Solomon's temple contains the golem of Prague.

A Jenga-style cylindrical tower of books that appears to go on forever.

Macabre astrological automaton clock dating to the late 1400s.

This tipsy office building in downtown Prague was originally called “Fred and Ginger.”

A grumpy old water goblin guarding an old mill on the Devil’s Stream in Prague.

This walkway is so narrow it needs its own light to stop pedestrian traffic jams.

A plaque marks the spot where the saint was shoved off the Charles Bridge and into the river.

When the rain falls, this drain system turns into a musical instrument.