the world's largest sundial samrat yantra in the ancient observatory of jantar mantar.

architecture landmark house tower largest sundial samrat yantra ancient observatory jantar mantar high staircase pavilion top curved marble measuring surface visible blue sky india jaipur world's sundial mantar jaipur astronomy pavilion stairway geometric shapes astrological brihat yantra large calculation astronomical steps marble measure unique jantar sun dial curve scale astrology measurement observatory staircase wandering famous historic observation extraordinary time copy space sky india sandstone unesco orange ancient stone clock historical old history city landmark blue