### Instruction:
What is the oldest hiking trail in the US?

### Input:
An early example of an interest in hiking in the United States is Abel Crawford and his son Ethan's clearing of a trail to the summit of Mount Washington, New Hampshire in 1819. This 8.5-mile path is the oldest continually used hiking trail in the United States. The influence of British and European Romanticism reached North America through the transcendentalist movement, and both Ralph Waldo Emerson (1803–82) and Henry David Thoreau (1817-62) were important influences on the outdoors movement in North America. Thoreau's writing on nature and on walking include the posthumously published "Walking" (1862)". His earlier essay "A Walk to Wachusett" (1842) describes a four-day walking tour Thoreau took with a companion from Concord, Massachusetts to the summit of Mount Wachusett, Princeton, Massachusetts and back. In 1876 the Appalachian Mountain Club, America’s earliest recreation organization, was founded to protect the trails and mountains in the northeastern United States.

### Response:
The oldest hiking trail in the US is an 8.5 mile long route leading to the summit of Mount Washington in New Hampshire. The route was first cleared in 1819 by Abel Crawford and his son.