hit with a hint of s on Nostr: does anyone know? #asknostr ...

does anyone know?
#asknostr

quoting
note1zfs…eqqh

testing the power of #nostr again
#asknostr #Korea #Seoul #Changdeokgung Palace (#창덕궁)
On a way back from the tour of secret garden (back in the Covid times) there is this stone well/hole
I cannot find any information about it online
What is that?

roughly located at coordinates 37.5820043064701, 126.99102713147293