Grapčeva cave is a Neolithic and Bronze Age archaeological site. Three distinct prehistorical cultures were discovered here: Nakovan, Cetina and Hvar culture.
Wikipedia https://en.wikipedia.org/wiki/Grapčeva_cave
More information on the tourist board of Jelsa's website http://www.tzjelsa.hr/en/tourism/tours/grapceva-cave/
Address 21465, Croatia
Coordinates 43°8'2.645" N 16°45'11.498" E