Its ruins are located on Monte da Pena, near the village of Barro, Torres Vedras municipality, in the Lisbon District of Portugal.

The tholos was discovered in 1908 by Paulo Bovier Lapierre, a French Jesuit priest who was teaching at the Barro college and convent at the foot of the hill.

Among the items found at the site were implements made from amphibolite, diorite and granite, limestone idols and vessels, ceramics, bones, jewellery, a copper dagger and metal rings.

It is believed that the dead were deposited in a seated position, accompanied by various artifacts and food.

The tomb was surrounded by an outer tumulus made of small stones, with a diameter of approximately 13 metres.