The tour guide said it is best not to take photos with the Terracotta Warriors and Horses. Why is this?

This may have something to do with Feng Shui. Chinese people pay great attention to auspiciousness when doing things. To put it bluntly, the terracotta warriors and horses in the Mausoleum of Qin Shihuang are burial objects. They are underworld artifacts and have a strong yin energy, so they are not suitable for group photos. Just like when visiting the Ming Tombs, try not to take photos.

Of course, whether you believe in this kind of thing or not, you don’t need to think so much if you don’t have any taboos in this regard.