The Mount Washington Auto Road (originally Mount Washington Carriage Road) is 7.6 miles of some of the most terrifying paved and gravel surfaces you'll find anywhere in the US.
The Auto Road, located in New Hampshire, rise from a starting altitude of 1,527 feet to the summit at 6,145 feet. The average gradient is 11.6%, making it one of the world's steepest paved roads.
The road was completed and opened to the public in 1861 and still today is open to the public, mostly for guided tours and only when the weather permits.
Though not known by most auto enthusiasts, the oldest sanctioned race in the US was hosted by the Auto Road back in 1904.
Even today, the Mount Washington Auto Road remains one of the most terrifying, yet satisfying drives in America.
Recently, the Auto Road played host to one of today's modern marvels: the Tesla Model S.
There was no racing going on, but the video captured of the Model S sedans climbing into the clouds is stunning.
For a feel of how terrifying it can be to drive Mount Washington, check out Travis Pastrana's record-setting run below.