If you're interested in learning about past civilizations, check out A.P. State Museum. Study its unearthed relics and gain an insight into the customs and cultures of people from long ago.
You'll be spoiled for sightseeing choice when spending time in Lakdi Ka Pul. A.P. State Museum is an ideal place to start here, but there are many other worthy places to consider. Charminar, Golconda Fort, and Birla Mandir Temple are not far from the exhibition of human history and will round out your day nicely.