Jefferson Towers
From WikiGTA - The Complete Grand Theft Auto Walkthrough
The Jefferson Towers are a reference of the Watts Towers or Nuestro Pueblo in Los Angeles. The work of art next to Jefferson in Los Santos is like it's example in Los Angeles made of scrap-iron and other cast off materials and consists of seven cone-shaped towers. Between the towers are two water-basins, of which one is empty and is therefor a good stunt-park for a BMX.
The Jefferson Towers where seen for the first time in the first trailers and screens of GTA San Andreas.