Unless you live in south Lincolnshire, it's unlikely you will have heard of the Grimsthorpe Castle. The Castle is an 18th century house with parts of it dating back to the 13th century.
We live nearby and the Grimsthorpe Estate has public footpaths running through it which make for good, short walks. Penny and I followed a circular route of just over five miles. It takes about 1 hour 45 minutes to complete. A perfect afternoon walk.