A restaurant and observation deck built in a unique broadcasting antenna.

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

The most visited, and possibly most controversial, museum in Germany.

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

Late at night, the bust of the "Dracula" actor was snuck onto the facade of this Budapest castle.

From Austrians to Nazis to Soviets, this historic Budapest fortress has a history as complex as the city itself.

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.

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

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

This plaque marks a place where one of Hollywood’s most famous dancers got his start.

The souvenir got the company’s founder out of a pretty pickle at the World’s Fair.

The largest clock face in the United States is twice the size of Big Ben and infinitely more ad-sponsored.

This public park was the site of the largest civilian disaster of the Civil War.

Once used to screen films for theater owners to rent, this historic building is now a start up hub.

Meet your friends, marry your true love, or tell your enemies to kiss your butt under this historic Pittsburgh timepiece.

With 3,000 bikes on display, the world's largest bicycle museum includes some famous rarities.

This eccentric mansion museum holds a impressive collection of rare and automatic instruments.

The name of this tiny pocket park tucked between two buildings on Manhattan's Upper West Side is Latin for its location: "seventy-one."

There aren't too many operational funiculars around, but Pittsburgh has two!

Funded by John D. Rockefeller, this is one of the earliest, and most beautiful, shopping arcades in America.

An 18th-century Spanish watchtower made entirely of seashell and concrete.

This spectacular public market has got meat, fish, vegetables, baked goods, and enough kielbasa for a lifetime.

The twin towers in this Chicago fountain use 50 foot tall video screens to spit on people.