Naqsh-e Jahan, is an square situated at the center of Isfahan city, constructed between 1598 and 1629 A.D. which is now an important historical site, and one of UNESCO’s World Heritage Sites.
It is also referred to as Shah Square or Imam Square.The square is surrounded by buildings from the Safavid era.  
On the west side is the Ali Qapu Palace. Sheikh Lotf Allah Mosque is situated on the eastern side of this square and at the northern side Keisaria gate opens into the Isfahan Grand Bazaar. Today, Namaaz-e Jom’eh (the Muslim Friday prayer) is held in the Shah Mosque.
In 1598, when Shah Abbas decided to move the capital of his empire from the north-western city of Qazvin to the central city of Isfahan, he initiated what would become one of the greatest programms in Persian history; the complete remaking of the city. By choosing the central city of Isfahan, fertilized by the Zāyande roud (“The life-giving river“), lying as an oasis of intense cultivation in the midst of a vast area of arid landscape, he distanced his capital from any future assaults by the Ottomans, the arch rival of the Safavids, and the Uzbeks, and at the same time gained more control over the Persian Gulf, which had recently become an important trading route for the Dutch and British East India Companies.
The chief architect of this colossal task of urban planning was Sheikh Bahai, who focused the program on two key features of Shah Abbas’s master plan: the Chahar Bagh avenue, flanked at either side by all the prominent institutions of the city, such as the residences of all foreign dignitaries, and the Naqsh-e Jahan Square (“Exemplar of the World“).
Prior to the Shah’s ascent to power, Persia had a decentralized power-structure, in which different institutions battled for power, including both the military (the Qizilbash) and governors of the different provinces making up the empire. Shah Abbas wanted to undermine this political structure, and the recreation of Isfahan, as a Grand capital of Persia, was an important step in centralizing the power.
The ingenuity of the square, or Meydan, was that, by building it, Shah Abbas would gather the three main components of power in Persia in his own backyard; the power of the clergy, represented by the Masjed-e Shah, the power of the merchants, represented by the Imperial Bazaar, and of course, the power of the Shah himself, residing in the Ali Qapu Palace.
It is one of the biggest square in Iran surrounded by 3 stunning monuments (Ali Qapu, Imam and Sheikh Lotfolah Mosques). You can use coaches to visit all around the Naqsh-e-Jahan square. There is a long bazaar around it where you can buy many beautiful and precious handicrafts as souvenirs and also traditional sweet pastry of Esfahan that it is called GAZ.