4 miles from Mareham on the Hill Parish

The remains of a 13th-century hexagonal castle, birthplace in 1367 of the future King Henry IV, with adjacent earthworks. Besieged and taken by Cromwell's Parliamentarians in 1643.

8 miles from Mareham on the Hill Parish

Remains of a grammar school for church choristers, founded in the mid-15th century by Ralph, Lord Cromwell, the builder of nearby Tattershall Castle (National Trust).

11 miles from Mareham on the Hill Parish

Built in 1877, this restored six storey mill with complete gear, sails and fantail still works today.

20 miles from Mareham on the Hill Parish

Standing almost in the shadow of Lincoln cathedral, with sweeping views over the ancient city and the countryside beyond.

29 miles from Mareham on the Hill Parish

A deserted medieval village, one of the best-preserved examples in England, clearly visible as a complex of grassy humps and bumps.

33 miles from Mareham on the Hill Parish

A little-known gem, Gainsborough Old Hall is among the best-preserved medieval manor houses in England. Partly brick and timber-framed, and mainly later 15th century with Elizabethan additions.