Bonneville Spring

Bonneville Spring is a folly building constructed in 1843 by Augustus Welby Northmore Pugin for the 5th Viscount Middleton, designed in a Gothic style reminiscent of the 13th century. The structure is made of brick with sandstone rubble and features dressed stone arches that contain colored stone shafts. It has a sham ruined entrance wall with a large arch at the center, leading to a vaulted main chamber and a smaller spring chamber built into the hillside.

The main chamber has a stone arch under a hood mould, with three orders of keel and roll moulding on bell-capital shafts, arranged one within the other. There is a small window to the right that illuminates the spring chamber. The main chamber also features a rib-vaulted roof with angled walls and stone bench seats, as well as colored shafts supporting the ribs and a central crown boss.

To the right is a small chamber that contains the spring, accessed by three steps, and is also rib-vaulted. Above the spring exit is a niche, with water flowing into a rectangular basin that has chamfered corners. A grotesque mask allows water to be piped through its mouth. The water then travels underground, re-emerging in a rock face lower down the hillside, creating an oval basin and a rock "grotto" effect.