Today I learned about the Paris Syndrome, which is a severe form of culture shock and can cause hallucination as well as an delusional state of mind along with symptoms such as sweating or dizziness. Probably it originates from over-romanticised expectations by a misrepresentation in the traveller’s origin country, resulting in the city of Paris not living up to the visitor’s expectations. The syndrome is most commonly experienced by Japanese but also Chinese tourists. The Japanese embassy even set up an own hotline for people experiencing it.

I came across this while having a lovely conversation in the AFediverseChat matrix room. With further details being available in the article posted there and, of course, Wikipedia, which holds further details on it.