Delhi has such an abundance of amazing monuments that this tomb complex does not quite get the acclaim that it deserves. Humayun’s Tomb is the tomb of the Mughal Emperor Humayun. The tomb was commissioned by Humayun's wife, Hamida Banu Begum, and designed by Mirak Mirza Ghiyath, a Persian architect. It was the first structure to use red sandstone at such a scale. The tomb was declared a UNESCO World Heritage Site in 1993, and since then has undergone extensive restoration work. Besides the main tomb enclosure of Humayun, several smaller monuments dot the pathway leading up to it, including one that even pre-dates the main tomb. Humayun’s Tomb represents a leap in Mughal architecture, and together with its accomplished Charbagh garden, it set a precedent for Mughal architecture. It is seen as a clear departure from the fairly modest mausoleum of Humayun’s father, the first Mughal Emperor, Babur.
The symmetrical and simple design on the exterior of the tomb is in sharp contrast with the complex interior floor plan, of inner chambers. It can be entered through an imposing entrance iwan (high arc) on the south, which is slightly recessed, while others sides are covered with intricate jaalis (stone lattice work). While the main tomb took over eight years to build, it was also placed in centre of a 30-acre Charbagh Garden (literally, Four Gardens), a Persian-style garden with a quadrilateral layout. The highly geometrical and enclosed Paradise Garden is divided into four squares by paved walkways and two bisecting central water channels, reflecting the four rivers that flow in jannat, the Islamic concept of paradise. Each of the four squares is further divided into smaller squares with pathways, creating 36 squares in all—a design typical of later Mughal gardens. Other monuments within the complex include the tomb and mosque of Isa Khan, Afsarwala’s tomb and mosque, Bu Halima's tomb and garden, Arab Sarai (the resthouse for the complex’s construction workers), Nila Gumbad (the “blue dome” tomb), and Chillah Nizamuddin Aulia—believed to be the residence of patron saint of Delhi, Nizamuddin Auliya.