At the head of Imam Square in Isfahan is the beautiful blue mosque. It's not the only blue mosque, but it's the largest and most famous one. It is huge both inside and out (about 140 000 square feet!). It was built in the 1600's by Shah Abbas, hence the original name of the Shah Mosque (Masjed-e Shah ). After the revolution it has become known as Imam Mosque (Masjed-e Imam).
And that's all just the outside of the mosque!! I'll feature the inside on another post.