Holy of Holies
In traditional Jewish sources, it is considered the place from which the creation of the world began. The site was used by the Temple in Jerusalem; most classical Jewish sources agree it was the location of the Holy of Holies. If it was the site of the Holy of Holies, that would make this the holiest site in Judaism. Jewish tradition views the Holy of Holies as the spiritual junction of Heaven and Earth, the axis mundi, and is therefore the direction that Jews face when praying the Amidah. In modern academia, this is usually the consensus, however, overall there is no conclusive opinion on the matter.