This astronomical observatory was built in 1742 by Maharaja Sawai Jai Singh II who also built the more famous one in Jaipur 10 years later. They were used for various astronomical observations and predictions.
I've posted both the colour and B&W versions. Preferences?
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Couldn't decide whether this should be in Travel, Architecture, Technology (it seems to be a bit of all three) so I've put it here!