Final answer:
Prophet Muhammad is buried in Medina under the Green Dome of the Prophet's Mosque, which was originally his house shared with his wife Aisha. This mosque is the second holiest site in Islam after the Kaaba in Mecca.
Step-by-step explanation:
The tomb of the Prophet Muhammad is located in the city of Medina, in what is now Saudi Arabia. According to tradition, the tomb is situated under the Green Dome of the Prophet's Mosque, which was originally Muhammad's house where he lived with his wife Aisha. This mosque, also known as Al-Masjid an-Nabawi, is the second holiest site in Islam after the Kaaba in Mecca. Muslims believe that Muhammad, after emigrating from Mecca to Medina, built his home next to the mosque he established. After his death, he was buried in his home, and as the mosque expanded, the tomb became part of the mosque complex.