Christian
Churches, Monasteries, Abbeys and Cathedrals, Churches and Monasteries, Jerusalem - Christian Architecture through the Age, Sacred Buildings of Suzdal, Symbols in Christian Art and Architecture
Jewish
Beth Am Synagogue, Bloom Southwest Jewish Archives: Synagogues, Center for Jewish Art, Hebrew University of Jerusa, Eastern European Synagogues, Etz-Hayyim Synagogue of Hania, Crete, Greece, Frank Lloyd Wright: Beth Sholom Synagogue, International Survey of Jewish Monuments, JewishEncyclopedia.com: Synagogue Architecture, Kol Hakehila, On the First Cambridge Synagogue
Mosques
Dome of the Rock, Islamicpix, Mosque, Mosque of Amr Ibn El-As, Mosques, Mosques Around the World, Renovating the Omayyad Mosque, Saigon's Mosque, Sinan Mosques in Istanbul, The Suleymaniye Mosque: Beyond Inspiration, Wikipedia: Great Mosque of Djenné
Temples
Pagodas, Architectural Drawings of Temples in Bagan, Beijing Service: Temple of Heaven, Buddhist Temples, Daladamaluwa Temple, Sri Lanka, Indian Temples, Khajuraho Temples, Lycian Influence on Indian Cave Temples, Salt Range Temples, Pakistan, Templenet, Temples
Jerusalem Holy Sites
Photographs with brief details of churches, monasteries, the Temple Mount and other sites from the Virtual Tour of Jerusalem by the Hebrew University of Jerusalem.
Sacred Places
Online accompaniment to a college course describing religious structures of all types.