Geek Trivia: Throughout The City Of Los Angeles, Hollow Shell Buildings Conceal What?

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Throughout The City Of Los Angeles, Hollow Shell Buildings Conceal What?
  1. Oil Rigs
  2. Service Tunnel Entrances
  3. Cold War Rocket Silos
  4. Telescopes

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Source : Geek Trivia: Throughout The City Of Los Angeles, Hollow Shell Buildings Conceal What?

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