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An octagonal 15th-century buttercross stands in the Market Place. It is a Grade I listed structure and an ancient scheduled monument. A charter to hold a weekly market was granted by King John in 1201 in return for an annual fee of a trained goshawk. Markets are no longer held but the buttercross remains at the centre of a shopping area.
It is an early 15th-century red brick-built castle by the then Lord Treasurer of England Ralph Cromwell. Is set in grounds which include original the original guardhouse, moats and the largest parish church in the country. Open every day except Wednesday from March–October, open at weekends in November and December.
It is the remains of a former Grammar School for church choristers that was built by Lord Ralph Cromwell who was also responsible for nearby Tattershall Castle. Accessible at any reasonable time.