The chapel is built with stone blocks and appears to be quite old. You pass through an open stone archway into an antechamber, inside of which is a very small archway with a door. Through this door are a few steps leading down into a natural cave where water constantly drips.
The inner doorway has three decorative symbols. There are two concentric circles above the door, and the doorjamb has what appears to be a solar symbol and a lunar symbol.