Ffynnon Cybi and associated works

Ffynnon Cybi is a significant site that includes a well house, a secondary well house added at the back, and a cottage for pilgrims located on the east side. The site is accessed by a wide paved causeway, with another causeway leading to a small toilet building set over the stream to the west.

The main well house is approximately 5 meters square inside, with splayed external corners and a height of about 3.3 meters, topped by a corbelled dome. There is a single door opening on the south side. The attached cottage originally had a single heated room with an attic floor that has since been removed. It features a door that opens against the external wall of the well house and has one window. The roof is pitched and includes a chimney on the thick east gable end, with wall offsets at the back.

The secondary well house is built into the slope at the rear and is positioned over the actual water source, with access on the west side against the back wall of the main structure. Inside the main well chamber, which shows evidence of a corbelled vault, there is a sunken tank measuring approximately 2.2 meters by 1.5 meters and 1 meter deep, surrounded by a walkway that is narrow at the back, with steps leading down on the east and west sides. The walls contain various niches likely used for bathers' clothing. Water flows from the smaller well house below the north wall directly into the tank and exits under the front wall into an open culvert that leads southwest. There was a later door, now blocked, that provided direct access to the cottage, which has a small fireplace in the gable wall and a recess that likely housed a stair on the rear wall.

A cobbled causeway, 1.1 meters wide, runs parallel to the culvert for about 17 meters to a single square latrine, which is now in ruins.