You can make an intersting excursions from Bahawalpur, full day trip requiring a four-wheel drive vehicle to Derawar Fort (Qila Derawar), through the semi-desert of cholistan. You need a guide to take you to Derawar, and also permission from the present Amir of Bahawalpur to get inside the fort.
Lahore fort (Shahi Qila). Origins of the fort go as far back as antiquity, however, the existing base structure was built during the reign of Mughal emperor Akbar (1556–1605), and was regularly upgraded by subsequent rulers, having thirteen gates in all. Thus the fort manifests the rich traditions of Mughal architecture. However, it is said to be built first in 800B.C.
Built before 1025 AD, the origins of the Shahi Qila go as far back as antiquity, however, the existing base structure was built during the reign of Mughal Emperor Akbar between 1556–1605 and was regularly upgraded by subsequent Mughal, Sikh and British rulers.