The celebrated eyesore created by starry-eyed sweethearts.

This irregularly shaped sea fortress has defended not one but three different sovereign states.

An alien church provides much needed silence in the midst of a Finland shopping center.

The library's graceful rotunda is like a bibliophile's temple.

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

It is said that each of the white stones in the red facade of this medieval house represents the head of a murdered Swedish noble.

Stockholm's tiniest statue is of a small boy looking at the Moon.

An ancient Viking runestone hidden in plain view in Stockholm's old town.

Stockholm's decidedly unique public transit system has doubled as the world's longest art gallery for decades.

Copenhagen's celebrated theme park and gardens.

One of two giant blue cockerel statues erected with an intentional double meaning.

Eight "Guardians of Health" protect this art deco water tower from pollutants and bacteria.

This old residential building was once the largest flour mill in the world.

The world's largest floating loon bobs in the lake to kick off an annual festival.

The "dragon babies" of southeastern Europe.

This historic timepiece is thought to be the only public clock in the world that keeps lunar time.

The palatial McDonald's that inspired Wesley Willis.

Illegal drag racing two stories beneath Chicago’s streets.

The unluckiest U-boat in the entire German fleet is now on display in a Chicago museum.

This $3 million model train takes you through Chicago, Seattle, and the thousands of miles in between.

This massive stained-glass masterpiece is thought to be the largest Tiffany dome in existence.

105-foot wide giant metallic flower blooms anew every day in the heart of Buenos Aires.

This large round boulder is said to emit spiritual power, but it may just be magnets.

Built in 1870 at the bridge that connected Buda and Pest, this spectacular incline railway was almost lost forever during World War II.