It's one of the most amazing trekking routes on Perú that join two of the biggest attractive archeological sites in the area. Choquequirao, known as the little Machu Pichu, and Machu Pichu. Around 110km with 7000m+ of vert climb. The normal trek takes 8-9 days, there are some people that have done it in around 2 days.

85km, 1,218m ascent, circular off road route on footpaths around the town of Aylesbury, touching the northern edge of the Chilterns. The route is marked by signposts with a special logo. 

https://www.ldwa.org.uk/ldp/members/show_path.php?path_name=Outer+Aylesbury+Ring has more details. 

Note that this is the longest of 3 Aylesbury "ring" routes:

Submitted by Janek Kaseja: