Modern Hagiography
Lives of the Saints by Alban Butler.
Lives of the Saints by Sabine Baring-Gould.
The Liturgical Year by Dom Guéranger.
The Lives of Saints, with Other Feasts of the Year, According to the Roman Calendar by Peter Ribadeneira.
Medieval Hagiography
The Cult of Saints in Late Antiquity Database
Writings of Pope Alexander
Art & Architecture
Catalogo generale dei beni culturali
Warburg Institute Iconographic Database
Music
Nihil sub sole novum 
