Land of Taj Mahal belonged to Raja Jai Singh of Amber

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Shahjahan gave 4 mensions in exchange for the land

Minarets lean slightly outwards

 to avoid optical illusion

Otherwise they would appear

  called parallax.

if viewed from distance

 leaning inward

Shahjahan was half Rajput

His Mother Jagat Gosai and His Grandmother Mariam-uz-Zamaniwere were the Rajput Princesses

The Taj Mahal was Conceptualized as earthly replica of the house of Mumtaz in the garden of paradise.

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In Quaran afterlife involves endless leisure in walled garden

Garden is divided into quarters, each quarter is sub-divided into 4

Golden Screen was installed around the upper cenotaph, which was replaced with present marble in 1643, fear of theft.

Construction cost of building the tajmahal was 50 lakh rupees

For comparison the servant of east india company in agra earned 3 rs a month.