Visual Index of Delhi Sites (Site name and description)
Humayun's Tomb Humayun's Tomb (1605-1613)
Grand tomb of a weak ruler.
Lodhi Gardens Lodhi Gardens (1444-1517)
Tomb site of the Lodhi rulers.
Quwwat-ul-Islam Quwwat-ul-Islam (1192-1316)
Delhi's first mosque.
Safdar Jang Mausoleum Safdar Jang Mausoleum (1753)
A mausoleum built in emulation of the Taj Mahal and Humayan's tomb.

Bibliography:

Images copyright 2001 and 2003 by the following individuals: Kaye Yeo Ahn, April Clark, Timothy J. Olker, Professor Gilbert Daenzer of Concordia University, Seward, Nebraska

Alfieri, Bianca Maria. Islamic Architecture of the Indian Subcontinent
  Lawrence King Publishing, 2000. London

Koch, Ebba. Mughal Architecture: an Outline of its History and Development (1526-1858)
  Prestel-Verlag publishers, 1991. Munich

Mishra, Laxman Prasad. Agra and Fatehpur Sikri
  Hawk Books, Ltd., United Kingdom

Tadgell, Christopher The History of Architecture in India.
  Phaidon Press, 1990. Singapore