A rock massif outside Baku with more than six thousand petroglyphs, the oldest up to forty thousand years old. The gaval dash stands here too — the tambourine stone, a slab that gives a resonant note when struck and was evidently played. Thor Heyerdahl visited three times and argued that the boats depicted are related to Norwegian petroglyphs, deriving a Caucasian origin for the Scandinavians — a hypothesis specialists did not accept.