I don't know the exact place
Medina Munnawara
No, there is not any grave inside Kaaba.
usually there is no especial building inside a mosque. if you mean a holy shrine it is the grave of the dead prophet or Imam.
Shakespeare's grave is located in England,Europe.
noone knows for sure
N/a
It was Abwa , near Madina .
Imam Ali Bin Abi Talib burried the prophet, just a note, Imam Ali(a.s) is not a Sahabi of the Prophet but he is the same as the prophet "Nafsu Rasoolilah"
It is now in Jannat al-Baqih
Tomb of the Prophet Noah in Nakhchivan area of Azerbaijan Republic. Local people strongly believe that the tomb contains the grave of the Prophet Noah. The name Nakhchivan derives from the Noah meaning the place where the Prophet Noah landed after the floods. The current grave structure under the tomb dates to 5-6th century.
because they did not know where was the exact location of the grave that is why they make it long to be covered because the place is being disturb by time
No, unless he was mummified his body would be dust by now!