Imam Square in Esfahan, Iran, is the world's third largest city square, after Red Square in Moscow and Tienenmen Square in Beijing. On the square is the Imam Mosque, the largest in Iran and one of the most important. This corridor leads from the site of an ancient well, now deep within the mosque, to the courtyard.
When the British occupied Iran, they used the square as a polo field. Today, the square has many other uses...but strangely enough, the polo field goalposts remain.