Two websites for ancient history fans:
As noted in AWOL, The Ancient World Online,
Ars Longa: An Index of Every Classical Reference Ever! (a work in progress, perhaps forever…)
and, as noted in Quartz,
THE PHILOSOPHER’S STONE:
This free online encyclopedia has achieved what Wikipedia can only dream of
The first, at Ars Longa, seeks assistance in their project of collecting every classical reference.