If you like OldInsuranceMaps, check out another OSM charter project, Yesterdays! Originally created by a team in Richmond, Virginia [0], with one more deployment covering the Inland Empire [1]. They plan to merge soon. Yesterdays imports Sanborn maps to help place historical photos as accurately as possible.
0: https://yesterdays.maprva.org/
1: https://yesterdays.inlandempire.place/