No one is quite sure just what Stonehenge was. It appears to have, among other things, been a sort of observatory for certain specific phenomena, such as the rising of the Sun on the solstice. It also served as a burial ground, and probably held ritual significance as well.
stonehenge
Indian Astronomical Observatory was created in 2001.
Astronomical Observatory of Capodimonte was created in 1812.
Brera Astronomical Observatory was created in 1764.
Uppsala Astronomical Observatory was created in 1741.
Andrushivka Astronomical Observatory was created in 2001.
Brooks Astronomical Observatory was created in 1964.
Astronomical Observatory of Lisbon was created on 1878-05-06.
National Astronomical Observatory of China was created in 2001.
Astronomical Observatory of the University of the Punjab was created in 1932.
Principia Astronomical Observatory was created on 1998-06-18.
La Plata Astronomical Observatory was created in 1883.