A fascinating collection of rock-carvings, thought to date from the Upper Palaeolithic or Mesolithic eras (between 20,000 and 30,000 years old, although estimates seem to vary depending on who you ask).
These include an X-Ray style bull, a dancing woman, several maze-like whorls and a mysterious symbol which defies identification.
The site is next to a marvellously tranquil little river. The exposed rock can get very hot, so keep your sandals on!
The site was free when I went, but there's a guide who'll need a tip. Don't forget to sign his visitor's book.
The site is situated in or near an open-cast Iron Ore mine in South Goa. Approx 15km south of Rivona. It isn't easy to find and is a little bit of an adventure.
Find a friendly taxi-driver to take you there - it's about two hours drive from Calangute, and you'll almost certainly need to ask someone for directions in Konkani.
Is this your business?