"You can," says the Berlin Wall. It's a somewhat ironic statement for a wall, especially one that was built to prevent people from escaping an oppressive Communist regime, but perhaps it was meant to encourage East German defectors looking for freedom. They resorted to all kinds of measures to get to the West side, including forging documents, ramming the wall, jumping from nearby buildings, and even flying balloons. About half of an estimated 10,000 defectors made it to West Berlin.
You see part of the Berlin Wall (and touch a piece of it!) at the Newseum. And while you're here, try out our virtual reality experience "Berlin Wall," which puts you in the shoes of an East German defector.