Start at Brookyln Bridge on the Manhattan side and finish at the end of the GW bridge on the New Jersey side as fast as possible, but have to cross all of Manhattan's bridges in the process. There are 17 bridges with pedestrian paths and this route cross all of them, there are a few train / car only ones that were excluded. 

The Gibb River Road is touted as one of Australia’s toughest 4WD tracks. Located in the Kimberley region of Western Australia this is an isolated and exposed gravel track with corrugations, undulating terrain and wild country.

It is important to note that Steve White successfully ran the track in 2000 prior to the route being acknowledged as runnable. 

This 9.15 mile run connects the southwestern terminus and northeastern terminus of Cartagena’s Caribbean Coast. The run alongside the Caribbean coastline tours the lagoon, Bocagrande, Centro, Walls of Cartagena, El Cabrero, Marbella, Crespo, then past Canal Bocana to finish on the Via al Mar bridge after crossing Boca La Boquilla.

Walls of Cartagena is an 5.83 mile run twice circumnavigating Cartagena’s old city walls. The double loop course begins and ends at the Cartagena Clock Tower (which is built into the old city walls with three open archways) and continues on Avenida Blas de Lezo, Plaza de la Independence, Calle del Arsenal, Avenida del Pedregal, Avenida Luis Carlos Lopez, Avenida Del Mar, Carrera 1, Calle de la Ronda, and back to the Cartagena Clock Tower before beginning the second loop.

The Biggest Badest Bestest Bits of Bullen - or the "B5" is exactly as its namesake suggests. An all encompassing tour of the Bullen Range Nature Reserve, situated a short drive to the west of Canberra. It comprises two main sections: the first, an up-and-over the full length of Bullen Range, heading south. This gives stunning views across to Canberra and the Cotter Dam as you ascend to the course's high point. Glimpses of the dishes used at Canberra's Deep Space Tracking Station are also possible through the trees.