Area 51-A

Area 51-A is a location Lisa found.

History
Lisa took the wrong bus when trying to reach the Springsonian Museum. While lost in an unfamiliar area, she thought she'd found Area 51, but a security guard who was covering part of the sign stepped to the side and revealed it was actually Area 51-A.

Non-canon
In The Simpsons Road Rage, the Area 51-A building contains a small flying saucer. It is located in Downtown Springfield near the airport and is situated next to Bay 64.