"There's a spy themed restaurant called the SafeHouse. It was founded in 1966 and it has a hidden location with a secret entrance. A password is needed to enter and if it's not given, patrons will have to do silly tasks that are broadcasted to people inside the restaurant in order to enter."
#45 There may be many of them, but there was one in Madison, WI back in the 80’s.
I've been to the one in Milwaukee. Didn't know there was one in Madison as well.