Large Hadron Collider and the Birthplace of World Wide Web.

Time stands still at this serene burial ground in the center of Budapest.

This quiet, unassuming spot in Budapest was the birthplace of the bloody 1956 Hungarian Revolution.

A statue in Budapest's Liberty Square honors the former U.S. president's efforts to end the Cold War.

This statue of a falling man commemorates a teenage martyr of the Hungarian Revolution.

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

This off-beat, quirky communism-themed bar isn't afraid to poke fun at its history.

Museum dedicated to the terror regimes of Hungary.

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

This Hungarian castle was built out of cardboard and wood until it proved so popular that it got upgraded to stone.

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

Reminders of the Battle of Berlin still scar the railway.

The sweet story of how American cargo planes became known as "Candy Bombers" during the Berlin Blockade.

A monument to the three wars that led to German unification towers within a Berlin traffic circle.

The only remaining U-boat that is still floating never actually saw any action in World War II.

The only microgravity tower in Europe can produce nine seconds of weightlessness.

A replica of the Liberty Bell rang daily from West Berlin's City Hall throughout the Cold War.

A Nazi concentration camp and Anne Frank's place of death.

Thousands of flowers create enchanting pink tunnels over the city streets.

A monument to the man who almost killed Hitler.

This water-tower-turned-high-end-apartment building was once the site of an early Nazi concentration camp.

When German-Iraqi relations broke down, this embassy was vacated post haste.

Once the tallest building in the world, this abandoned church is now a monument to the destruction of WWII.

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