Zanjan's Soltaniyeh; World’s Largest Brick Dome

Soltaniyeh Dome is the 3rd biggest brick dome in the world and the Mausoleum of Ilkhan Oljaytu highlighted accomplishment of Iranian architecture and is the top three huge historic buildings in the world.
http://zanjantourism.blog.ir/post/Zanjan-s-Soltaniyeh-world%E2%80%99s-largest-brick-dome