360° views of the city plus five floors of optical illusions and hands-on science.

A copy of the famous statue can be found in this Florence piazza, along with one of the most breathtaking views of the city below.

Five candy-colored villages on the Italian Riviera.

A lover's walk between hilltop towns, decorated with graffiti love notes.

The now-overgrown beach resort was once frequented by Yugoslav military elite.

These historic defenses ensured the city within would survive hundreds of years of occupations, sieges, and invasions.

A tour of underground Berlin takes you through WWII air raid shelters and tunnels used to smuggle people out of East Germany.

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

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

The world's tallest church tower reveals a spectacular view to anyone up to the task of climbing the daunting staircase.

Albert Einstein's head sticks out of a snail shell stacked on a rocket in this truly bizarre monument to the scientist.

Enter the cabin of a life-sized Hindenburg replica.

A lakeside footbridge that records Nobel Prize laureates' names in metal silhouette.

The Argonaute submarine was the French navy's pride and joy in the 1950's.

The water-powered carriages are long gone, but for over a century this funicular railway has been the fastest route to the highest point in Paris.

This life-size replica of the Statue of Liberty's flame is also a tribute to Princess Diana by default.

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

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

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

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.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

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

This once-forgotten oasis in the middle of Lisbon was first created over a century ago quite by accident.

Catering to broken dolls for almost 200 years, this repair shop is now a charnel house of doll parts.