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This is a "kettle lake": 10,000 years ago a great lump of ice persisted after the glaciers retreated. It created a hollow, flooded by water from the surrounding bedrock. The Centre has water activities such as sailing, windsurfing and kayaking. The perimeter path (mile and a third) is suitable for wheelchairs.
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It was built in the 1870s (with the tower added in 1906) and is the only church designed by the Pre-Raphaelite architect Philip Webb. The stained glass windows were designed by Edward Burne-Jones and William Morris. (The Earls of Carlisle were paying for all these big talents.) It's an active Anglican church but is often locked outside services, as it has been vandalised.
Impressive ruin of an Augustinian priory founded around 1169 and dedicated unusually to Mary Magdalene. Being close to a quarrelsome border it was raided by the Scots, and Edward I stayed here several times. He was ill during his last visit of 1306 and had to stay six months, impoverishing the priests with the cost of accommodating his family and retinue. The Scots King Robert the Bruce arrived in 1311 "committing infinite evils"; later the nations made peace, whereupon the priory was smashed up all over again. It was dissolved in 1538 and fell into ruin.