Why did the ancients build tombs?

The ancients believed in the soul and thought that the soul was still alive after death. So, build a luxurious grave for later enjoyment. Moreover, the ancients believed in Feng Shui. It is believed that choosing a cemetery with good feng shui will bring good luck to future generations, become a big official, make a fortune and so on. Therefore, choosing a good feng shui and building a good tomb are conducive to their own enjoyment and the development of future generations. Therefore, graves must be built.