About 1km towards Mashhad, the Boq ’ e-ye Hordokieh is a massive brick-domed 14th-century mausoleum that looks especially impressive when floodlit at dusk. There are several theories as to the structure’s purpose. The most popular (and least likely) is that it was a prison for the assassin of Imam Reza. The rather bare interior displays models of other tomb towers including the impressive Akhangan Tower (12km northeast of Tus) with its recently added blue-scalloped ‘roof’.
