The Marsworth Circular Series is a series of caches along a 4-mile circular walk along the base of the Chiltern Scarp, passing through areas of archaeological interest. Some are possible as a cache and dash but if you complete the walk there are many caches (not just ours) along the route.
We recommend you take a copy of the circular route map with you which can be downloaded from the related web pages link.
This cache is an easy park and grab, but even nicer as part of the full series. This part of the route passes under what was originally the London and Birmingham Railway completed in 1835.
You're looking for a small black round container, contains logbook and pencil and room for small swaps.
Ybbx haqre.