Running or walking around Roman Hillforts is an alternative ‘walk’.
Five of scores of Hillforts to be found in the UK:
- (Sycamore Gap (Hadrian’s Wall) – of course!)
- Hembury, Blackdown Hills, Devon
- Old Sarum, Salisbury, Wiltshire.
- Richborough, Sandwich, Kent.
- Yarborough, Lincolnshire
A good place to start is the Atlas of Hill forts
Countryfile’s article is interesting, and lists hill forts.