Bob’s has been taking up prime real estate in Nob Hill since 1960. The secret to their staying power? Really, really good donuts. They don’t get crazy with out-there flavors and prefer to use old-school baking methods. While here, take the BIG ONE challenge, which requires you eat the oversized $8 donut in three minutes or less—maybe best attempted after a late night out, as it’s open 24-hours a day. Succeed and get your name on the coveted Wall of Fame.