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Definition of observatory : 1. A building fitted with instruments for making systematic observations of any particular class or series of natural phenomena.
2. A lookout on a flank of a battery whence an officer can note the range and effect of the fire.
3. A place or building for making observations on the heavenly bodies.
4. A place, as an elevated chamber, from which a view may be observed or commanded.

Synonyms:

observation post, beacon, sentinel, tower, overlook, lookout man, outlook, lookout, observation tower, awareness, watch, sentry, lookout station, picket, scout, spotter

Usage examples:

• Thus situated, we began to clear places in the woods, in order to set up the astronomer's observatory, the forge to repair our iron- work, tents for the sail- makers and coopers to repair the sails and casks in; to land our empty casks, to fill water, and to cut down wood for fuel; all of which were absolutely necessary occupations. - "A Voyage Towards the South Pole and Round the World, Volume 1", James Cook.
• We now reached the Observatory. - "A Bibliographical, Antiquarian and Picturesque Tour in France and Germany, Volume Two", Thomas Frognall Dibdin.
• Full descriptions and pictures of all the modern Magnetic Survey Instruments now used at Kew Observatory. - "The Great Musicians: Rossini and His School", Henry Sutherland Edwards.