Modern Hagiography
Lives of the Saints by Alban Butler.
Lives of the Saints by Sabine Baring-Gould.
Victories of the Martyrs by Saint Alphonsus Liguori.
Medieval Hagiography
The Cult of Saints in Late Antiquity Database
The History of the Martyrs of Palestine by Eusebius (under the name Epiphanius)
Art & Architecture
Nihil sub sole novum 