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

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

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

Dedicated to the European Sinti and Roma peoples murdered during the Holocaust.

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

Tiny memorials honor individual victims of the Holocaust.

The site of the famous Nazi book burning campaign of 1933 remembers its "Night of Shame".

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

A brush maker used his factory to protect blind Jews from the Gestapo.

A narrow passage next to a cafe leads to a courtyard exploding with murals, tags, and paste-ups.

A fascinating insight into daily life in the Eastern Bloc.

Oldest existing church in New York and the inspiration for Washington Irving's "The Legend of Sleepy Hollow."

One of the earliest bowling lanes in the U.S. doubled as a sewing school during a time when women had little job opportunity.

This abandoned ironworks was once the most important military supplier in America.

100 massive sculptures in the Hudson River Valley.

This natural rock "church" might not be a proper chapel but that doesn't mean it's not beautiful.

The schoolhouse where Jesse Merwin, the inspiration for the "The Legend of Sleepy Hollow" character, once taught.

At this farm in upstate New York, the former president plotted his reelection campaign.

The Hudson River School comes alive at this palatial estate.

A nearly 100-year-old dining car in upstate New York embodies the golden age of roadside dining.

The life of one of FDR's possible mistresses is preserved in her palatial Hudson Valley mansion.

"A hideous albatross in the Hudson River Valley."

The rustic think-space of famed naturalist John Burroughs stands exactly as he left it.

Why have you never heard of the second most popular tourist site in New York?