Cold war icon and onetime "hole" in the iron curtain.

On the Spree bank, discover one of the last reminders of a symbolic wall that divided, and was torn down by the people.

The old observatory in Copenhagen has a spiral corridor used as a racetrack.

Danish tourist destination well known for open stalls where vendors sell marijuana on the street.

Abandoned bull fighting ring, slowly falling apart in Uruguay.

A 125-meter long "tribute to the Brazilian people."

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

Buenos Aires' city of the dead contains some very famous remains, including Eva Perón.

A supersonic jet stands on a pedestal in this rural village as a monument to military aviation.

The signs of a long buried road can still be found hidden beneath a London sewer grate.

Several plaster noses are hidden in plain sight around London's Soho neighborhood.

This historic covered bridge contains a series of macabre paintings that communicate one thing: everyone dies.

Now an entertainment complex, the Lingotto building was once an avant-garde auto factory with a test track on the roof.

Water and windows define this defensive Italian well.

This deceiving white sand beach gets its brilliant hue from the chemical discharge of a nearby factory.

A stunning bridge that appears as if it's lunging to the shore, and has a legend of a devilish architect.

Walk through a fairytale in Tuscany.

Old batteries and frog skeletons reside in this lakeside monument to Alessandro Volta.

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.

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

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

Said to be the only museum in the world dedicated to the most classic of all blooms, the rose.

A magnificent, glittering building tucked into a tiny Bulgarian mountain town.

"Holy Wisdom" overlooks the city that became its namesake.