Kreuzberg is known to many for numerous Turkish immigrants from eastern parts of Turkey, and the yearly May Day riots. This is because before the fall of the Berlin Wall in 1989, Kreuzberg was isolated. Its eastern parts were almost entirely surrounded by the Wall. This area consequently had cheap rents and lower-income families as well as squatters from the radical left. The western part of Kreuzberg also bordered onto the wall, and it was here where Checkpoint Charlie was.