Earlier quoted context omitted.
Nothing to see there. Not long even Muslims get bored there. Wahabis are not really big on history and artifacts. If you think that this is some kind of an open air museum, think again.
It is not a place of entertainment or sight-seeing. Hajj is a Farz for Muslims. Anyone who enter's Mecca ought to do so with the thought of his Lord on him, seeking redemption and forgiveness. Or Would you worship your Lord only if it is 'entertaining to you'?
Non-Catholics can enter the Vatican. Certainly you don't think the Vatican exists only to entertain, do you?
As a core part of the Sikh faith, "the Harmandir Sahib is open to all persons regardless of their religion, colour, creed, or sex." (Quoting Wikipedia.) Do you really think that makes it solely a place for sight-seeing?