During the regin of Shah Jahan, there was undisturbed peace within the country. There were no foreign threats and Shah Jahan too devoted most of his time in maintaining peace and order in the country. Trade and commerce flourished bringing in lots of wealth. The land was fertile and revenue flowed into the treasury.
Shah Jahan carried out many works of public welfare. Roads, canals, bridges, sarais, etc., were constructed for the welfare of the people. Similarly, during the famine and plague he did a lot to relieve the people of their sufferings.
Shah Jahan had a natural love for magnificence, which was reflected in the buildings that he constructed. His reign is, in fact, called the Golden Age of the Mughal Architecture. One of the most important buildings constructed by him is the Taj Mahal, which was built in the memory of his beloved wife Mumtaz Mahal.
The Moi Masjid is also constructed in the Agra fort. It is made of white marble. The Musamman Burj also of white marble is the place in the fort from where Shah Jahan used to view the Taj during his last days when he was made a prisoner by his son Aurangzeb.
Shah Jahan built his father’s mausoleum at Lahore (now in Pakistan).
After his beloved wife’s death, Shah Jahan shifted his capital from Agra to Delhi. He founded a new city called Shahjahanabad. He constructed the Red Fort. It is built of red sandstone. Many important buildings like Diwan-i-Khas, Diwan-i-Aam and Rang Mahal are inside the fort. The famous peacock throne was kept here. The throne was studded within precious stones.