Quite incredible structures.
There are 5 such monuments scattered throughout India: Jaipur, Mathura, Delhi, Ujjain, and Varanasi.
This is the largest one.
This is very much like visiting a modern sculpture park
There are a pair of these facing north and south.
They represent the Earth's two Hemispheres.
It's a UNESCO World Heritage site.
There are 19 instruments in total.
These super sized monuments allow observation of astronomical positions with the naked eye.