Red, white, and blue painted steps along with a Union Jack celebrate the outcome of Gibraltar's 1967 referendum.

The world's first electric battery-powered submarine.

The two massive guns that defended Cartagena Bay.

Fascinating exhibits of prehistoric and ancient artifacts displayed with a uniquely modern touch.

Some believe that the artist behind this whimsical statue inserted his own likeness as a way to discreetly flip the bird.

Statues of a fire-breather, a clown, and a whole performing troupe celebrate Luxembourg's creative side.

This magenta statue commemorates the legendary marriage between a mermaid and the city's founder.

This small chapel built into rock is the oldest place of worship in Luxembourg.

The official motto of Luxembourg reminds passersby of the Luxembourgish commitment to their national identity and sovereignty.

The first green space constructed on an elevated viaduct.

This charming cobbled backstreet is the most Instagramable street in Paris, much to the residents' annoyance.

This statue of the great Argentinian car driver is located near a famous curve of the Monaco Grand Prix.

This massive blockhead sculpture hides an entire library.

This saucy statue once caused outrage among locals.

A memorial to honor those who were killed in a Bastille Day terror attack in Nice.

This artistic fountain display pays homage to this area's theatrical history.

The smallest museum in Basel, Switzerland, is a two-foot-by-two-foot window in the door of a 600-year-old house.

A futuristic rocket marks the spot where three borders meet.

This ferry carries passengers across the Rhine propelled by no engine or paddles but by the river's current.

The most impressive of Basel's three remaining city gates.

Switzerland's oldest public observatory is an important part of the Zurich cityscape.

Featuring a meatless buffet fit for kings, this family-owned Zurich eatery is considered the oldest vegetarian restaurant in the West.

A 30-foot-high stream of chocolate flows continuously at the Lindt Home of Chocolate.

Liechtenstein's royal family calls this medieval alpine castle home.