The importance of Humayun's Tomb in the evolution of Mughal architecture is great. It is the first of a long series of dynastic tombs and innovative in a number of ways, notably by virtue of the fact that it introduced the garden tomb to the subcontinent. Humayun had travelled widely in the Islamic world, notably in Persia and central Asia, and brought back with him ideas that were applied by the architect of his tomb, under the direction of his widow, in this tomb.
UNESCO

Several Mughal emperors are even buried inside Humayun’s mausoleum. Humayun’s mausoleum has earned the title of necropolis of the Mughal dynasty. No sepulcher in India or elsewhere contains such a high number of tombs of the Mughal emperors and their relatives. Moreover, Humayun’s tomb is the first garden-tomb on the Indian subcontinent

The mausoleum stands on a massive platform which has a height of up to 7 meters. The building is constructed from red sandstone, while the tomb itself is made of yellow and black marble. The two-storied mausoleum is crowned with white Persian style marble dome that seems weightless and imponderable. The height of Humayun's Tomb is 47 meters, and its breadth is 91 meters

Not even the dogs can withstand such heat

The cenotaph of the ruler is located in the center of the upper tier in a large room decorated with several rows of arched windows

The central chamber is octagonal with corner-chambers which house the graves of other members of the royal family. The real grave of the emperor is on the basement floor.
♫♫ DELHI, INDIA - HUMAYUN'S TOMB ♫♫ [youtube.com]
Merveilleux palais! La 1 rends bien en HDR!
J'ai vu les chiens se rafraîchir aussi dans le ruisseau...Ils savent ce qui est bon !