Watts Towers

The Watts Towers are a series of towers connected to each other.

History
Homer and Marge come here and Homer pings one of them causing them all to shake. He then notices a sign saying "Do Not Plink". Rolling 80 then turn up and tell them not to do that before they realize that it is Homer Simpson.

Behind the Laughter
In real life, there are 17 towers. However, there do not seem to be that many shown.