At the foot of the Puig de Sant Marti mountain is the cave of the same name. In it there are 2 chapels in the Gothic style. They were used by the first Christians, where their cult was still forbidden. 1. Sant Jordi (1632) and 2. Sant Marti. The cave was closed in 1827 due to poor condition, restored in 1886 and open to the public, meanwhile it is in danger of collapsing and may no longer be entered... actually ;) I went down anyway, over the fence.
Hidden in the forest is a cave accessible via stairs, which looks more like a ridge from the outside. The hole is certainly 10 meters deep, but is blocked off by a fence.