Architecture and wall paintings play the remarkable role in old Iran. Like architectures of many other eastern countries, curve-shaped structures and artistic tiling are available in many cities of Iran. But, what makes Isfahan distinctive from other cities is its plenitude of historical monuments. The curve is seen everywhere, from the bridges to the domes of the mosques. The curve-shaped ceiling of the mosque of Shaykh Lotfollah, for example, is shockingly symmetrical so that attracts Mathematicians’ attentions. Also the bridges that highly suggest the Graphs designed by Sheikh Bahaei are made up of several curve-like openings. Khaju bridge and Si-o-Se-Pol are the most well-known bridges in Isfahan. Each of them has exclusive attractions. The opening parts of Khaju bridge have designed so that people in specific direction can see candle shapes between these opening parts known as Khaju candles. Si-o-Se-pole has been located in the widest part of the river; the reflection of the bridge to the river makes an amazing view. Although Isfahan is suffering from many attacks in the past, she is still charming and alive; Isfahan handicrafts are of the most beautiful ones among handicrafts; among them Ghalamzani and Minakari are two of the most beautiful ones.
For further information about Isfahan you can also refer to the wikipedia article about Isfahan.