Taya cave is a cave one kilometer long whiciwas dug by a person in the Kamakura period.
You can actually enter inside.
You will go by bus from Oofuna station(Jr tokaido line and keihin tohokusen line)
You must get off the bus at doukutu mae station.
Because it is close to Kamakura famous of sightseeing spot, it is good according to return of Kamakura.