Fretwork at Humayun's Tomb

"Humayun's tomb is the tomb of the Mughal Emperor Humayun in Delhi, India. The tomb was commissioned by Humayun's first wife and chief consort, Empress Bega Begum, in 1569-70, and designed by Mirak Mirza Ghiyas, a Persian architect chosen by her." So says Wikipedia. 
This looking out through an amazing fretwork window