Centennial Olympic Park in Atlanta, GA opens, though the 1996 Summer Olympics are still two months away. Following the Olympics, the stadium will be partially reconstructed as Turner Field.

On May 18, 1996 — Centennial Olympic Park in Atlanta, GA opens, though the 1996 Summer Olympics are still two months away. Following the Olympics, the stadium will be partially reconstructed as Turner Field.

Source:
Baseball Reference May 18