A prosperous agricultural town in the centre of Lincolnshire with a remarkably fine church, which has a number of interesting memorials. King John took refuge in the Castle here after losing his jewels and baggage in the Wash. Castle now is little more than grassy mound. Bass Maltings is an enormous feature of the town and tourist information centre is in old windmill. Nearby is Cranwell, the Royal Air Force College with a special visitor centre.