Historical sites are excellent points of contacts for the current civilization to past civilizations. No matter how modern science and technology has changed our lives, we still face lot of problems and studying past civilizations could provide potential clues to solve them. Apart from this fact, historical sites also broaden our horizon and help us appreciate our ancestors and their civilizations, besides offering us great get-away locations.
This is a very broad question. You need to look at the reason why World Heritage Sites are inscribed which should give you the answer. About 40 years ago the international community was brought together to save a historic site in Egypt from flooding. It was decided after this to identify sites arround the world which are valuable to mankind not just to the local population. No site is inscribed without the wishes of the country it belongs in and the inscription is voted on by 21 countries (drawn from every region and changed every 3-6 years). Therefore "Why to save World Heritage Sites" the answer is because the international community have decided that the properies are valuable for mankind.
There are 832 cultural World Heritage sites in the world.
There are 206 natural World Heritage sites.
when and why are the world heritage sites in Egypt?
UNESCO, chooses world heritage sites.
There are 7 world heritage sites in Tanzania.
UNESCO says the world heritage sites belong to everyone.
Ireland has 2 World Heritage sites, both are cultural.
In 2009, there were 890 World Heritage sites; 688 cultural sites, 175 natural sites and 27 mixed sites.
Italy is home to the greatest number of World Heritage Sites, with 50 sites inscribed on the list.
Cambodia has 2 world heritage sites; Angkor and the Temple of Preah Vihear.
There are 5 steps in the nomination process for world heritage sites.
Because those sites are protected by UNESCO. The world heritage sites may not become lost, because of their rich history