Only the most intrepid mountain bikers tackling the Magnificent Seven (Mag 7), a series of trails near Moab, put the terrifying Portal Trail on their bucket list. This two-mile (3km) path starts on a rim above the Colorado River and has adrenaline junkies hooked with its sheer cliffs, awesome Moab Valley views and total lack of safety railings.

Bikers are advised to dismount and walk at the hairiest parts due to the high risk of accidents. The trail has a reputation for being one of the deadliest and most thrilling bike trails in America.

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