Yazd Mosque

The Jameh mosque in Yazd has the tallest portal in Iran, and some of the highest minarets.

I love the design on the underside of the balconies (click to see better) -- it's even more elaborate than the decoration in areas more likely to be noticed. I don't think anyone uses the balconies much anymore -- the call to prayer is usually a recording -- but it's appropriate that if a believer should cast his or her eyes up, every detail would be beautiful.