This dome is located near the shrine of Imam Reza (AS) and they are about 10 minutes away by car. It is said that this dome belongs to the tomb of Sheikh Mohammad Momin Aref Estrabadi, one of the famous mystics. The dome is more blue-green than green.
It doesn't matter which residence or hotel you stay in Mashhad, you can easily visit the spectacular green dome of this pilgrimage city from anywhere in Mashhad.