This Slovakian statue of an emerging sewer worker might just be a bronze peeping tom.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

A World War II evacuation tunnel turned into a history display of Croatian state and people.

This 135-year-old weather station studied the effects of the climate on human health.

A whimsical bridge adorned with decorative dragons.

This abandoned Slovenian military barracks has become a punky-political art squat.

One of the best-preserved Roman amphitheaters is still used today, but for less brutal events.

Ernest Hemingway was the first to sign this colorful wall covered in thousands of celebrity signatures.

This Roman arena once played host to bloody gladiatorial battles.

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

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

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

This gem from the industrial age helps visitors and residents alike traverse hilly Stockholm.

The world's biggest floating museum in Gothenburg, Sweden.

This building holds the embalmed remains of the leader of the Bolshevik Revolution.

World's largest bell sits on the grounds of the Kremlin in Moscow.

Dozens of padlock-trees along the Moscow River.

Thirteen sculptures in central Moscow graphically depicting vices of the modern world.

One of the world’s best microminiaturist, Nicolaï Siadristy displays his lifetime of tiny creations in this museum.

This 1000 year old relic-filled cave monastery and UNESCO World Heritage Site also hosts an amazing micro-miniature museum.

This Dresden church was purposely rebuilt Protestant after being demolished in World War II.

High atop the Eiffel Tower is a small apartment built exclusively to entertain the science elite and make the rest of Paris jealous.

Hear the quietest sound from across the dome.

Three columns of volcanic rock shoot out of the ocean.