The Factory would feel pretty much like any big Silicon Valley headquarters, if you couldn’t see the death strip. In the 19th century, this 130,000-square-foot Berlin warehouse held a brewery. In the 20th, it was an air raid shelter, then rested in the shadow of the Berlin Wall. East German watchtower guards gunned down people trying to scramble across the border. (Hence the term “death strip.”) Today the retrofitted space is home to dozens of tech companies, including Uber and Twitter, and is the headquarters of the music streaming service SoundCloud.