A memorial in the Tiergarten is a reminder of the suffering inflicted on homosexuals by the Nazi regime.

An imperial church bombed to ruins during WWII now stands as a jagged memorial.

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

Metro station with a claim to rock n' roll fame.

The last remnants of a massive medieval wall that once encompassed the city of Berlin.

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

A 12th-century fortress containing some of Berlin's oldest buildings.

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

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

A piece of baseball history is preserved in a Pittsburgh parking lot.

This quarter-mile tunnel under the Bluff in Pittsburgh bends at a 45-degree angle.

Home of the only civilian casualty at the Battle of Gettysburg.

When oil was discovered just outside of Pittsburgh, the city became home to this regional stock market.

This shrine dedicated to the Virgin Mary is also a tribute from a mother to her fallen son.

Color-coded signs direct drivers on a network of routes designed to avoid Pittsburgh traffic.

The Pennsylvania shopping center was once the setting for the 1978 film, "Dawn of the Dead."

An American flag was erected for every day that passed during the Iranian Hostage Crisis.

In the parking lot of a fast food restaurant, a statue memorializing a prolific bull elephant.

This spot memorializes one of the greatest plays in NFL history, unless you happen to be a Raiders fan.

A portion of the old Pirates stadium over which a defining home run once flew still stands even after the rest of the stadium was torn down.

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

Sections of the iconic limestone columns have been left uncleaned as a reminder of the city's polluted past.

This extraordinary Depression-era expenditure was modeled after a postcard of a Mediterranean hotel.

"Where the ducks walk on fish."