History repeats itself, over and over again. We know this and we will forget this for our comfort and happiness. We will remember it when the same phenomena occurs again, proving itself again.
Hence, we need to record them. Earlier it was carved in stones. Then painted and written in papers. Then the historic sites were captured in cameras. And now it is digital era. So we must update them into a digital Historic site index with photos and information.
Some historic site might be the memory of wars, mysteries, happiness, sorrow, love, science, betrayal, politics, and tactics. So history contains everything within it, so as the historic sites.
How much historic site your place has, so much precious it is. Transfer all of them into digital images and create an invaluable historic site index to serve as a reference for the future generations.