Cheung Po Tsai Cave
Cheung Po Tsai Cave is a natural cave in Hong Kong where the Guangdong pirate Cheung Po Tsai, according to legend, kept his treasures. It is located on the outlying island of Cheung Chau and is a popular attraction there. No treasures have been found in the cave.
Cave data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).