This is a hand-painted lantern slide photo, taken in 1895.
Other pre-telescopic observatories include Stonehenge; Great Zimbabwe; the Castle Tower in Palermo, Sicily; a site in Nuremberg, Germany; the Jantar Mantar in Jaipur, Rajasthan, India; a site in Cairo, Egypt; and of course Tycho Brahe's famed Uraniburg.
Uraniburg, Hven Island, Denmark. Built by Tycho Brahe in the late 1570s.
It fell to ruins before the mid-19th century.
