The rock that forms Seneca Rocks began as fine grains of sand laid down during the Silurian Period, roughly 440 million years ago, on a vast sand shoal at the edge of the ancient Iapetus Ocean. Over eons, that sand compacted into Tuscarora quartzite, one of the hardest, most erosion-resistant sedimentary formations in the Appalachians. Then tectonic forces went to work. More than 200 million years ago, at the close of the Paleozoic Era, the Wills Mountain Anticline folded the underlying rock into a massive upward bulge. The geological strata rotated a full 90 degrees, turning what had been horizontal ocean floor into a vertical wall. Millions of years of erosion stripped away everything softer, leaving the quartzite standing as a dramatic fin approximately 250 feet thick. The formation consists of a North and South Peak separated by a central notch. Until October 22, 1987, a striking isolated pinnacle called "the Gendarme" occupied that notch. Then, after 440 million years of standing, it toppled to the ground.

Long before European surveyors passed through the region around 1746, the area at the foot of the Rocks served as a crossroads. The Great Indian Warpath, known locally as the Seneca Trail, followed the Potomac River valley, and the Algonquian, Tuscarora, and Seneca nations used the route for trade and war. Archaeological excavations during construction of the Seneca Rocks Visitor Center uncovered evidence of two Native American villages, the more recent of which thrived about 700 years ago with roughly a dozen dwellings. The first European settlers arrived at what they called "The Mouth of Seneca" around 1761. The Rocks were sketched by David Hunter Strother, a well-known writer and illustrator who worked under the pseudonym "Porte Crayon," around 1853. His drawings were later reworked into a popular wood engraving published in an 1872 issue of Harper's New Monthly Magazine, introducing Seneca Rocks to a national audience for the first time.

Today Seneca Rocks has 375 major mapped climbing routes, ranging from the most accessible (5.0) to the fiercely demanding (5.14b). Nearly all require the leader to place their own protection, making this a mecca for traditional climbing. Both the East and West faces of the North and South Peaks offer single and multi-pitch routes up to 300 feet in length. The South Peak holds a singular distinction: it is the tallest peak east of Devils Tower in Wyoming that is accessible only by 5th-class climbing. The vertical cracks created by the rock's dramatic uplift provide what climbers prize most, excellent jamming and reliable gear placements. Two climbing schools operate at the base, and guide services from surrounding states regularly bring clients to test themselves on the quartzite walls. A warning sign near the North Peak bears a sobering tally: since 1971, 15 people have died from falls at Seneca Rocks.

The Rocks have weathered more than geological erosion. The original visitor center opened in 1978 on a $297,000 grant. A flood severely damaged it in 1985. On May 26, 1992, an arsonist destroyed the building entirely. The current Seneca Rocks Discovery Center, completed in 1998, was built with a $5 million grant. But the site has also attracted a less expected community: glider pilots. Seneca Rocks' distinctive appearance in aerial photographs made it an ideal turnpoint for soaring competitions and record attempts. Pilots flying 500-kilometer out-and-return courses from Ridge Soaring Gliderport in Julian, Pennsylvania, used the formation as a photographic checkpoint. On October 15, 1995, Canadian pilot Walter Weir completed a flight using the Seneca Rock turnpoint that was recognized as a world record at the time. From the air, the narrow quartzite blade is unmistakable, a white scar cutting through the green forest of the Monongahela.

A romantic legend clings to the Rocks, written in 1932 by Harry Malcolm Wade. In his tale, Princess Snow Bird, daughter of Chief Bald Eagle of the Seneca, challenged her suitors to follow her to the crest. Of seven who tried, only one survived the climb to take her hand. The story has become part of local lore, but the facts unravel it: the Seneca homeland was in western New York, and those who passed through this part of Virginia were strictly transients. The historical Chief Bald Eagle, who died in 1779, was actually a Lenape leader from central Pennsylvania, not a Seneca of Virginia at all. The real romance of Seneca Rocks needs no embellishment. It lies in the quartzite itself, in the ancient ocean sands turned vertical, in the pitons still embedded from Depression-era pioneers, and in the climbers who arrive each season to test themselves against a wall that has stood since before the Appalachian Mountains existed in their current form.