The outer dome is lifted from a drum that has 16 sides. An inverted lotus finial base crowns it; however, the lotus finial is missing now. Lotus motifs can be seen on all 16 sides of the drum which have minarets. There is a chhatri (pavilion) placed on every corner decorated with yellow, green, and blue tile inlay. The tomb houses two marble graves which are engraved with Quran verses.
Though there are several other monuments located inside the Humayun’s tomb complex, Barber’s tomb is the closest to emperor Humayun’s tomb. Some other monuments inside include Neela Gumbad, Isa Khan Tomb, Bu Halima’s Tomb & Garden, Afsarwala Tomb & Mosque, etc. Make sure you visit all of them when you visit Humayun’s tomb.