At the foot of the hill, just across from the museum, are the carefully exposed ruins of what was a fully functioning monastic hospital, in use by the 9th century AD if not earlier. The site preserves the foundations of the wards, the consulting rooms, the inscribed stone medicine trough (a stone basin shaped to a body, into which patients were lowered for oil-bathing treatment), and a stone formulary of medicines.
Free; takes about twenty minutes to walk round. Often skipped by visitors who go straight to the climb.