This curious building hides eclectic details like medieval gargoyles alongside naked angels and Art Nouveau mosaics.

An exclusive waiting room built for the royal family in the 1920s is hidden in Milan’s central station.

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

This palatial spiral staircase was so unusual the name "snail" was given to the noble family who built it.

Five candy-colored villages on the Italian Riviera.

An underground city of ancient quarry tunnels hid thousands of Allied soldiers in WWI.

This modest marker near Notre Dame identifies the very center of Paris.

This statue was given to France by the United States to commemorate the centennial of the French Revolution.

This 1920s Dutch barge is now a floating bookstore.

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

The 2,000-year-old beam is tucked within the pedestrian entrance to the old London Bridge.

The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

Ship-sized kinetic sculptural fantasy.

This one has sailed five times as far as Sir Francis Drake's famous ship.

This striking observation tower shaped like a spinnaker sail is the newest icon in historic Portsmouth.

A half-mile-long stretch of medieval forts built after a devastating pirate attack persists amid the modern port city.

The largest greenhouse in the world is home to over one million types of plants.

A petite castle folly in the English countryside.

This Welsh village gave itself a ridiculous name in a publicity stunt a century ahead of its time.

A former fisherman's hut deemed too small for habitation is now a delightful tourist draw.

Mysteriously stacked storefront paths give this medieval British town an iconic style like none other.

The great polar explorer is remembered in this far northern town, where he embarked on his final expedition.

This floating sculpture of ice is a poignant reminder of nature's power.

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