Observatory n. : A place or building for making observations on the heavenly bodies.

Observatory n. : A building fitted with instruments for making systematic observations of any particular class or series of natural phenomena.

Observatory n. : A place, as an elevated chamber, from which a view may be observed or commanded.

Observatory n. : A lookout on a flank of a battery whence an officer can note the range and effect of the fire.

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Taxonomy
Observatory, the Observatory, Los Angeles, telescope, Griffith Observatory, Planetarium, Astronomy, Leonard Nimoy, Event Horizon, Horizon Theater, Free Admission, Greek Theatre, Samuel Oschin, traffic, Sky, Griffith Observatory Los Angeles, Observatory News, school program.

Defination from the web:
Observatory, a nonprofit educational institution whose purpose is to provide information on astronomy and related sciences to the public.