From the World Heritage inscription:
Built during the second half of the 16th century by the Emperor Akbar, Fatehpur Sikri (the City of Victory) was the capital of the Mughal Empire for only some 10 years. The complex of monuments and temples, all in a uniform architectural style, includes one of the largest mosques in India, the Jama Masjid.
Located about 45 minutes outside of Agra (with traffic) Fatehpur Sikri is both a palace and an imperial city. Located on high plateau, it gives a fantastic view of the surrounding countryside as well as cooler temperatures.
I’d highly recommending hiring a guide if you are paying a visit. There are many details which you would never know about unless they were pointed out to you.
Things to take special note of include: the human Parcheesi board, the dramatically different sizes of the buildings for the emperors Mulsim, Christian and Hindu wives, and elevated platform in the building where the emperor heard petitions.
Make sure not to miss the Jama Masjid. It is easy to miss it if you are only in the palace area. It is a massive arch with serves as the entrance to the mosque, made even more impressive because it is set on the top of a hill. As your guide to make sure to take you there.
The parking area for Fatehpur Sikri is a distance away from the palace, so note that you have to take a shuttle bus to get there and back.