Ritmeyer is known for the solid scientific research he has done on the archaeology and architecture of the Temple Mount in Jerusalem. He discovered archaeological evidence for the location of Solomon's Temple, the emplacement of the Ark of the Covenant on the Foundation Stone, and the location of the platform as extended in the First Temple period, probably during the time of Hezekiah described as a square of 500 cubits in Mishnah Middot 2.1. He has demonstrated that one of the steps leading to the Dome of the Rock is actually the top of a remaining stone course of the pre-Herodian Western Wall of the Temple Mount platform.