Jantar Mantar has it all. Here are some parts of the Jantar Mantar that caught my eye.
One level in the wall has a series of small windows to let the sunlight in for the measurement of time.
The structure is complex. Stairs, bridge, sun dials... you can spot a lot here.
The above image shows what lies below the sun dial. The image bellow shows the dial in its full bloom.
Pythagoras must have inspired the structure below. Wild guess.