Mount Washington is an ultra-prominent mountain in the state of New Hampshire. It is the highest peak in the Northeastern United States at 6,288 feet (1,917 m) and the most topographically prominent mountain east of the Mississippi River. The mountain is notorious for its erratic weather, once holding the world record for the highest wind speed measured at the surface. It lies in the Presidential Range of the White Mountains, in Coös County, and its summit area includes the Mount Washington State Park (surrounded by the White Mountain National Forest). Mount Washington is the highest peak in the Northeastern United States and an ultra-prominent summit. It’s notorious for erratic weather, once holding the world record for highest surface wind speed. The mountain was known to Native Americans as Agiocochook, meaning “Home of the Great Spirit,” and indigenous peoples regarded its summit as sacred, rarely climbing it. The first recorded ascent was in 1642 by Darby Field, who climbed it with two Native guides. By the mid-19th century, the summit had become one of America’s first tourist destinations: the Summit House hotel opened in 1852 and the Tip-Top House in 1853. The Mount Washington Auto Road was completed in 1861 and the Cog Railway in 1869, the latter being the world’s first mountain-climbing cog railway. These developments (many of which still operate) made Mount Washington a centerpiece of White Mountain tourism. The summit area is partly in Mount Washington State Park, surrounded by the White Mountain National Forest.