Mecca. A place of worship that was built by Abraham and his son Ismael according to muslims.

Madina. The prophet Mohammad pbuh took refugee in this city from Mecca. There are many historical places, his grave and masjid al nawabi.

Jerusalem. A place of importance for all three abrahamic religion. The Temple of Solomon of jews, a place of worship was built here. The muslims call it by bayt al mukaddas or masjid al aqsa. It was destroyed and rebuild a few times. Currently there are two mosques in the ground of al aqsa but the entire square is considered holy. The jews want it to build their third temple, muslims want it for their masjid al aqsa and the christians... Umm I don’t know if Christians have any to do with temple of Solomon but Jerusalem is a holy land for them since Jesus lived here.