Shah Mosque, also known as Imam Mosque, Isfahan, Iran
The Shah Mosque is a public mosque sitting at the south end of the huge Naghsh-e Jahan square. It is one of the great treasures of Persian archecture from the Safavid period, and it, and the square it sits on, are UNESCO World Heritage Sites.
Its construction was ordered by the first Shah Abbas of Persia in 1611 and it was finished in 1629. It is an architectural masterpiece with its beautiful seven coloured mosaic tiles and calligraphic inscriptions.
Another must see famous mosque, the Lotfollah Mosque, an equal architectural masterpiece, is located on the east side of the square and can be seen here with detailed shots of its exquisite mosaic tiles: http://goo.gl/lUO4nw