The Crusaders associated the Holy of Holies with the Well of Souls, which is located under the Foundation Stone of the Dome of the Rock. Most Orthodox Jews today completely avoid climbing up to Temple Mount, to prevent them from accidentally stepping on the Most Holy Place or any sanctified areas. A few Orthodox Jewish authorities, following the opinion of the medieval scholar Maimonides, permit Jews to visit parts of the Temple Mount known not to be anywhere near any of the sanctified areas. Orthodox Jewish visitors to the Temple Mount, who come especially from those groups associated with the Temple Institute and its efforts to rebuild a Temple, seek to conform to the minimal requirements for coming near the Temple, such as immersing in a mikvah (collection of water), not coming during or following menstruation or immediately following a seminal emission, not showing their back towards its presumed location, and other strictures.