I am visiting New York (Manhattan) as part of a vacation, research and possible intern positions. I am from Europe and want to visit some startups while me being there.<p>What are the must visit? And what is the best way to contact them?
Try to stop by General Assembly. As the largest coworking space in Manhattan, you'll see a lot of early-stage work taking place. They also offer classes and workshops on different topics (for a fee).
