A woman visits a mosque in Naghshe Jahan Square in Isfahan, Iran, on July 17, 2019. Constructed between 1598 and 1629, Isfahan is now an important historical site, and one of UNESCO's World Heritage Sites. (Xinhua/Ahmad Halabisaz)

People spend their time in Naghshe Jahan Square in Isfahan, Iran, on July 17, 2019. Constructed between 1598 and 1629, Isfahan is now an important historical site, and one of UNESCO's World Heritage Sites. (Xinhua/Ahmad Halabisaz)

People walk at a mosque in Naghshe Jahan Square in Isfahan, Iran, on July 17, 2019. Constructed between 1598 and 1629, Isfahan is now an important historical site, and one of UNESCO's World Heritage Sites. (Xinhua/Ahmad Halabisaz)

Tourists visit Naghshe Jahan Square in Isfahan, Iran, on July 17, 2019. Constructed between 1598 and 1629, Isfahan is now an important historical site, and one of UNESCO's World Heritage Sites. (Xinhua/Ahmad Halabisaz)

A man rides a bike on Naghshe Jahan Square in Isfahan, Iran, on July 17, 2019. Constructed between 1598 and 1629, Isfahan is now an important historical site, and one of UNESCO's World Heritage Sites. (Xinhua/Ahmad Halabisaz)

A woman takes pictures in Naghshe Jahan Square in Isfahan, Iran, on July 17, 2019. Constructed between 1598 and 1629, Isfahan is now an important historical site, and one of UNESCO's World Heritage Sites. (Xinhua/Ahmad Halabisaz)