Hawaii
Expert
Keauhou Landing Road
Lava rock gauntlet to Captain Cook's final landing
Trail Type: Technical 4x4
Hawaii
Difficult
Maunakea Summit Road
Sacred summit climb to astronomical observatory
Hawaii
Difficult
Pohakuloa Training Area Perimeter Road
High desert military perimeter through volcanic saddle
Hawaii
Difficult
Mauna Loa Observatory Road
Brutal climb up the world's most massive volcano
Hawaii
Expert
Waipio Valley Access Road
25% grade into Valley of the Kings
Hawaii
Difficult
Old Pali Highway
Abandoned highway through Ko'olau razor ridges
Hawaii
Difficult
Kahana Valley Backcountry Road
Deep jungle penetration into pristine valley
North Dakota
Expert
Rattlesnake Creek Badlands Trail
Clay hell through badlands fossil country
North Dakota
Difficult
Antelope Creek Fossil Trail
Dinosaur fossils in remote Hell Creek badlands
North Dakota
Difficult
Missouri River Confluence Backcountry Trail
Remote river confluence technical challenge