The Tomb of David and Solomon

Archaeologists readily identified these enormous holes in the ground as the tombs of the kings of Judah. This is almost certainly the tomb of King David, and the adjacent tomb of King Solomon right next to it. Few people visit the location, and those that do visit don't realize what it is they are looking at. Across the city on Mount Zion, you have the tomb of David, which is not a tomb at all, but an ancient messianic synagogue.