With the accelerating speed of modernization, more and more old  buildings came into our eyes in both the cities and some small towns. Sometimes the historical buildings may stymied the moving steps of city construction. So what should we do to these buildings, should we keep them in our places or replace them with modern buildings? In my opinion, all what we should do is preserving them as better as we can. Because they are not only legacy left by our ancestors, but also the catalyst of our city development. 
First of all, acting as treasures gifted by our human's history, the ancient buildings were precious belongings for us to learn culture and history from them. We could study historical art as well as building techniques according to the appearance and structure of these buildings. For example, in China, many ancient buildings were full of frescos and sculptures inside. It was these beautiful art works that we could touch the thought of the old artists. What was more, we could also appreciate amount of the awesome arts now. Who can imagine that if we destroyed all of the buildings with paintings and so on, how huge the loss we had made. Therefore, it is considerable meaningful if we could preserve the old buildings in our land. 
In addition, historical buildings are supposed to be quite useful to our city. That is to say, with these building Being the typical represents of our history and culture, we could take advantage of them by developing tourism of a city. Others could gain access to our culture and learn something from older's wisdom presents by the construction. A good example of these is the pyramids in Egypt now. the splendid pyramids have converged countless tourists from all over the world, and I believe all of them were bent by the great of the old culture. As a result, Egypt benefit a lot from this, and the pyramid eventually sparked the economic booming of that area. Thus, keep old buildings could make positive influence on the development. 
On the other hand, some of the ancient constructions really bothered the modernizations of an area. We need the places to optimise the outlook and the function of the city wich might be taken by an old building. However, simply removing it with a modern construction instead would not be a wise choice. With advanced technology, Why couldn't we use better designs and programmings for the city to make ancient one look comfortable. By doing this could we make a compromise between the ancient ones and modern ones. 
In conclusion, as far as i am concerned, we should protect the ancient buildings. In consequence, we could preserve plenty of beautiful spots as well as help develop our economy.