Question: is there a rock in the dome of the rock

Answer: Yes, The Foundation Stone (Hebrew: אבן השתייה‎ Even ha-Shtiyya or Hebrew: סֶּלַע‏‎ Selā‛, Arabic: صخرة‎ Sakhrah ``Rock'') is the name of the rock at the centre of the Dome of the Rock in Jerusalem. It is also known as the Pierced Stone because it has a small hole on the southeastern corner that enters a cavern beneath the rock, known as the Well of Souls. There is a difference of opinion in classical Jewish sources as to whether this was the location of the Holy of Holies or of the Outer Altar. According to those that hold it was the site of the Holy of Holies, that would make this the holiest site in Judaism (Tanhuma, chapter 10).