The observatory.

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GTA III====

The Cedar Ridge Observatory is an observatory in Cedar Grove, Shoreside Vale, Liberty City. The observatory is inaccessible to the player. If the player manages to reach there, the ground will not be solid. The observatory is featured on Rockstar's site for Grand Theft Auto III.

GTA Liberty City Stories

The observatory returns and the mountain is difficult to reach to see the observatory. It's best to have a Sanchez or Maverick to see it and can be viewed by sniper.