Another one could be Bermuda Triangle, a lot of material on internet if any one has not presented it already. but its already famous.
One more topic is "Shah Dauley ka Chuha" ya Dauley Shah ka chuha" a social crime in Pakistan.
a youtube video about this
But it depends more on how you present it.
You can also presnt on some myth or about some history event.
Like pyramids of Egypt, or about
Great Sphinx
Well myths are really interesting, search some from Greek history and if you can get enough material from internet about this. That would be good.
Or what about brief description of 7 Wonders of the world. Their introductions.
But whatever you present concentrate more on "why and how" part" rather than on "what " part
Okay brother, that's all from me.
I hope some other will also suggest something innovative and interesting.