Generally speaking, broken objects are always not beautiful. But there are so many ancient buildings, sculptures and even the remains of daily necessities are considered beautiful. How can this be explained? Perhaps because these remains of aesthetic value were originally It has important value, either because of its considerable scale or because of important practical functions, such as magnificent palaces, mausoleums, temples, city walls, ancient bridges, ancient towers, etc. , containing the extraordinary wisdom and tremendous toil of predecessors, whether it is ruin Yu Bingyu or natural disasters will cause people to deplore and care for the whole body. In UNESCO's "World Heritage" project, there are a large number of such ancient buildings, such as the Great Wall of China, the Parthenon temple in Greece, Angkor Wat in Cambodia and much more. This text mainly explains. ['How to appreciate ancient architecture.', 'Why are "ruins" beautiful.', 'What is the incomplete beauty of architecture.', 'Selection criteria for "World Heritage".']