via The Thaiger, 25 June 2020: Tourists behaving badly, Thailand domestic tourism edition.
A historic cave in the southern province of Trang, said to be in use by humans for at least a 1,000 years, will no longer be open the the public after it was defaced by graffiti. After a millennium of human use, the Khao Pina Cave, famous for its stalagmites and stalactites, was found scribbled with names and nonsense soon after it was reopened along with other attractions as part of the fourth phase of reopening from the Covid-19 lockdown.
The cave is located within a temple, Wat Khao Pina, and failed attempts by monks there to remove the graffiti mean visitors will now only be allowed into the cave under the supervision of tour guides.
Source: Graffiti in historic Trang cave means public access restricted | The Thaiger