In Your Pocket travel writer Andrew Quested at the Topography of Terror, the temporary exhibition set up at the site of the former Gestapo headquarters in Berlin. Grab the free audioguide from the trailer and begin your walk among the cellar remains of the Main Reich Security (SS) Office. It could take over an hour, but this might be the best place for a cram session about the Byzantine organization of Third Reich police, military, and security groups. There seemed to be no shortage of people willing to serve in the name of oppression. This area once full of Nazi administrative offices was bombed to bits in World War II. Bordering what remains a wasteland is a souvenir-ravaged stretch of the Wall. More info here: