Answer:

The fort that was not built by Akbar is Gwalior Fort.

Akbar and his Forts:

Akbar, the third Mughal emperor, was known for his architectural achievements and his patronage of the arts. During his reign, he constructed several forts and palaces across the Mughal Empire. These forts not only served as military strongholds but also as centers of administration and art.

Lahore Fort:

The Lahore Fort, also known as Shahi Qila, is located in present-day Pakistan. It was originally a mud fort, but Akbar rebuilt it with red sandstone between 1556 and 1565. The fort houses several palaces, gardens, and notable structures such as the Sheesh Mahal and the Diwan-i-Aam.

Agra Fort:

The Agra Fort, also known as the Red Fort of Agra, is situated in Uttar Pradesh, India. It was initially a brick fort, but Akbar transformed it into a grand structure made of red sandstone. Construction began in 1565 and was completed by his son Jahangir. The fort encompasses several palaces, including the famous Jahangiri Mahal and the Khas Mahal.

Allahabad Fort:

The Allahabad Fort, located in Uttar Pradesh, India, was also built by Akbar. He commissioned the construction of the fort in 1583 at the confluence of the Ganges and Yamuna rivers. The fort served as an important strategic point and was later expanded by his successors. It is known for its unique architecture, blending Hindu, Islamic, and European styles.

Gwalior Fort:

While Gwalior Fort is an iconic fort in Madhya Pradesh, India, it was not built by Akbar. The fort has a long history, with its origins dating back to the 8th century. It was captured by various rulers over the centuries, including the Tomaras, Mughals, Marathas, and Scindias. Although Akbar did not construct this fort, his grandson Aurangzeb made some modifications to it during his reign.

In conclusion, of the given options, Gwalior Fort was not built by Akbar. However, it is worth noting that Akbar's architectural contributions include the Lahore Fort, Agra Fort, and Allahabad Fort, which are renowned for their grandeur and historical significance.