H-Bomb Playground - you happen to be walking around Fair Park and you hear an air raid warning, head over to the playground at the old Science Place 2 building and knock on this four ton cement door. If you’re lucky it will open, and you’ll be invited to spend some quality time with the folks in charge of the Dallas Civil Defense Emergency Operations Center. This H-Bomb rated bunker was built in 1961 and can comfortably house 30 Civil Defense officials, and I assume, their spouses and children for two weeks. After that you’ll be dying to get out.     1680 1st Ave. Dallas TX.