observatory

/əbˈzəɹvətɔɹi/
noun
  1. 1

    A place where stars, planets and other celestial bodies are observed, usually through a telescope; also place for observing meteorological or other natural phenomena.

  2. 2

    A lookout (vantage point with a view of the surrounding area)

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Source: https://en.wiktionary.org/wiki/observatory