Visit Mashhad, Iran
Mashhad is home to the Holy Shrine of Imam Reza, otherwise known as Astan-e Qods-e Razavi. This is one of the world's most visited places of pilgrimage.
Rubat Sharaf Caravanserai, Iran
Mashhad is something of a one-hit wonder. It is a hugely important and venerable hit nonetheless, so worth a special visit in its own right.
The sight in question is the Holy Shrine of Imam Reza, otherwise known as Astan-e Qods-e Razavi. This is one of the world's most visited places of pilgrimage, with estimates of annual visitors hovering around the 10 million-plus mark.
Visiting
The pilgrimages are an all-year-round affair so expect the city to be busy whenever you visit. Apart from being a base to explore the northeast of Iran, Mashhad is also a useful stopping off point for those heading on into Central Asia.