Raphael Kinney proposed this unusual 31km route:

A 60km urban trail around London created to mark the Queen's Diamond Jubilee, and the London 2012 Olympic games. 

See: https://tfl.gov.uk/modes/walking/jubilee-greenway

In 2012 work began on the 47-mile Hills to Sea Trail from Unity Village to City Point in Belfast, and the last section was completed in September 2016. The footpath winds its way to the coast through the communities of Unity, Knox, Freedom, Montville, Morrill, Waldo and Belfast linking with schools and farms along the way. Most sections of the trail are open year-round for hiking, snowshoeing and cross-country skiing. The Hills to Sea Trail connects with existing trails of Coalition partners and uses some of these trails for the Hills to Sea route.

Via Algarviana is a Great Pedestrian Route (GR13) which connects Alcoutim to Cabo de São Vicente, with a length of 300km, mostly installed in the Algarve mountain . It is intended that became part of the Trans-European routes, linking to the E4 and E9.

Tyler Johnson submitted this challenge, which climbs 3 popular summits near Missoula: