Puerto Rico
ExpertCamuy River Underground Access Road
Underground river system through limestone karst caves
Difficulty: Expert
Level 4
Puerto Rico
ExpertCordillera Central Toro Negro to Villalba Summit Road
Cloud forest ridge run through radio tower maze
Puerto Rico
ExpertRío Grande de Arecibo Gorge Access Road
Limestone labyrinth with teeth-grinding descents
Puerto Rico
ExpertBosque Estatal de Toro Negro Observatory Road
Cold War ruins in the clouds above Puerto Rico
Puerto Rico
ExpertMona Passage Lighthouse Keepers’ Supply Road
Caribbean island isolation meets technical punishment.
Puerto Rico
ExpertMonte Jayuya Radio Tower Technical Ascent
Vertical coffee plantation climb to island's second peak.
Puerto Rico
ExpertRio Abajo Forest Karst Cave Access Road
Underground Puerto Rico through karst hell.
USA
ExpertVermont’s Class IV Mount Tabor to Mount Bromley Mining District Road
Granite ledges and quarry ruins in the Green Mountains
New Hampshire
ExpertFranconia Notch State Park Old Bridle Path Service Road
White Mountain granite-crawling at its most brutal
Maine
ExpertMaine’s Spencer Bay Ice Road Extension
Frozen lake crossing to logging country.