Olèrdola has known the presence of man from the Bronze Age until well into the 20th century. This fact shows the strategic importance of a settlement located on the hill of Sant Miquel, which overlooks the Penedès plain. Olèrdola is currently one of the sites of the Museu d’Arqueologia de Catalunya (Catalonia Archaeology Museum) and is part of the Iberian Route.

Its position made Olèrdola an ideal place in times of war but barely habitable during periods of peace. For this reason, the site also has known long periods of abandonment.

The population have left their mark. There is an Iberianoppidum, a fortified and walled village. There is also an impressive Roman fortification to control the territory and, in particular, the access road to Tarraco (the old name for Tarragona). Finally, within the group is a medieval town, with Romanesque and Pre-Romanesque churches (Sant Miquel and Santa Maria), the castle and anthropomorphic tombs dug out of the rock.

At the beginning of the 12th century, the decline of Olèrdola and the displacement of the population in the plain began.

Currently preserved are the remains of the Castle, the Church of Sant Miquel, a Romanesque building, and the Necropolis of Sant Miquel, an excellent display of the characteristic burials from the High Middle Ages.