Cuatro Puertas is a site featuring caves made by the indigenous people. The main cave has 4 entrances, hence the name, and is about 17 x 7,5 m big. The flat area in front of the entrances has roughly the same wize and round indentations, possibly used for poles to hold a roof. The big cave is thought to have been the court of a king or priest. a bit above it on the top of the 300m high hill is another site of worship or sacrificial altar, called the Almogaren. You can see how tiny I am in comparison. From here you also have a good view of the coast, and nowadays of the airport.
On the south side of the hill there are more caves:
Cueva de los Papeles: with a door-like entry that has a rectangular extension and a sloping entrance that leads to a drainage system. Inside are more indentation for something and some hardly visible triangular markings.
The last is an entrance to more caves that lead into each other. We couldn't actually access them, but more clearly handmade entrances to caves can be seen on the steep south side of the hill. Some books suggest that is was kind of a convent for priestesses (maguadas).
Even outside the actual caves, there are what seem to be storage areas hewn into the rock (Or maybe they were caves to accomodate toyvoyagers, the size fits!), and what looks like fireplaces.