At the limits of the Garraf region, the park is a natural watchtower crowned by the Olerdola Castle and remains

A castle from the 10th century, with a Templar construction from the 13th century and two towers from the 15th century, encased on the old road from Sant Quintí to Sant Joan de Mediona, it guarded this strategic enclave for centuries.

Olèrdola is an archaeological site occupied for 4000 years as well as a natural park.

The church of Sant Elies in Mediona, which was first documented in 1301, could be Romanesque, according to the historian and writer Esteve Cruañes