What ancient buildings are well preserved? How do you think ancient buildings should be protected? What are the disadvantages?

I don't know if it's unprofessional, just personal advice:

Reduce the number of tourists, reduce the damage of carbon dioxide, trampling and stroking on ancient buildings, and at the same time do a good job in greening the surrounding areas, pay attention to the ph value of rainwater and prevent acid rain;

Understand the structure and materials of ancient buildings, and often use corresponding materials and methods to repair ancient buildings, such as timely repair when paint falls off, and timely brush protective paint on columns and murals;

Watch out for insects and ants. Ancient buildings often contain wooden structures, which are easy to breed insects and ants.

Above. The key is maintenance and the inheritance of ancient buildings. We don't need Gu Lou zombies, what we need is beautiful architectural style. If we combine it with modern beauty, we can build China traditional style and modern and convenient houses and public buildings, which will be the best protection for ancient buildings. In particular, people's attitude towards ancient buildings has recently been demolished because of the real estate boom. Only when people sincerely recognize and attach importance to it and are willing to protect it can we really do a good job in the protection of ancient buildings.