Built principally as a military establishment by Akbar in 1565, the red sandstone Agra fort was partially converted into a palace during Shah Jahan's time. Though the principle structure was built by Akbar many more additions were made by his grandsons. This massive fort is 2.5 kms long and is considered as the predecessor of the Delhi Red fort. The colossal walls are 20 feet high and the whole fort is encircled by a fetid moat. Amar Singh gate towards the south is the only entry point in the fort. The building and structures inside the fort gives an impression of a city within the city. Many of the building inside the fort is now closed for the public. The marble pearl mosque inside the fort is one of the most stunningly beautiful mosques in India.

Diwan-e- Am
This structure was originally made out of wood but was later constructed in the present form by Shah Jahan. The throne room bears a clear influence of Shah Jahan style with the inlaid carvings and panels of marble with floral motifs. This hall of public hearing is the place where the Emperor heard the petitions of the public and met the officials. The hall of public hearing gives way to the Nagina Mosque and the Ladies bazar where only ladies merchants were allowed to sell items to the Moghal ladies.

Diwan-e-Khas
This was the hall of private audience. This hall was also added by Shah Jahan. This hall is divided into two rooms connected by three arches and it was here that the famous peacock throne was kept before being shifted to Delhi by Aurangzeb and finally carried away to Iran.

Octagonal Tower
This exquisitely carved tower is close to the Diwan-i- Khas. It was here that Shah Jahan spent last seven years of his life imprisoned by his son Aurangzeb. The tower was considered to provide one of the best views of the Taj but today the pollution has reduced the visibility. The tower is in bad shape today but blank spaces and the empty inlay works give an idea how this building must have looked in those days.