Keilder obviously for the road, The Farne Islands if you want to get off the bike for a while, Hermitage Castle, Cragside (National Trust), Holy Island and for pure scenic riding anything inland of the A1 is worth a punt.
Someone mentioned Beamish. Well worth a visit but give yourselves a full day to explore it.
Cragside can be added to our Holy Island, Bamburgh route for a quick visit (NT members)
Beamish, is in the bank encase the weather is bad otherwise I don’t want to use that much riding time
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