Valencina de la Concepción archaeological site.
Located at the extreme north of the Aljarafe ridge, the Valencina de la Concepción archaeological site is one of the most important groups of dolmens in Europe, dating back to the Copper and Early Bronze Ages. Among these funeral monuments, the dolmens of La Pastora, Matarrubilla and Ontiveros are outstanding. The first two can be visited via a prior visit to the Museum.
Discovered in 1860, it is a tomb consisting of a long corridor of over 46 metres in length, divided into three stretches with a circular tholos, or burial chamber, at the end. The roof and floor are made with large slabs of stone while the walls are of slate.
This dolmen, discovered in 1917, has stone walls with layers of kneaded clay. The roof is made of large stone slabs and the floor is beaten earth. Inside the chamber, the outstanding feature is a large quadrangular, carved monolith which is believed to be an altar or a platform for offerings.