hi! not discouraging more information, but FYI, there have been a few posts on both subjects, so you can get started on these:

• Any evidence of the origin of the black stone in the Ka'ba in Mecca?

• Who really built the Kaaba in Mecca

• Do we know who built the Kabba in Mecca?

• Is there any evidence to the idea that Muhammad established the Hajj as a Pillar of Islam in order to gain support from the powerful merchants that 'ran' the city?

• The 'Black Stone' that sits in the Kaaba in Mecca: is it the same stone that was put there by Mohammed? Or was it replaced at some point in history?