Set foot in/on something - Idioms by The Free Dictionary
set foot in/on something
set foot in (some place)
To enter some location. It wasn't me—I've never set foot in that building before! If you ever set foot in my house again, I'll have you arrested.
set ˈfoot in/on something enter or visit a place: Neil Armstrong was the first man to set foot on the moon, in July 1969. ♢ She’s been complaining from the moment she set foot in this hotel.