You could go to the Computer History Museum in Mountain View. I don't know of any startups where you can just walk in off the street, but you can go to Hacker

You could go to the Computer History Museum in Mountain View. I don't know of any startups where you can just walk in off the street, but you can go to Hacker Dojo: https://hackerdojo.org/ https://hackerdojo.org/ They even offer tours.