Old Spanish Trail

Not your average roadside historical marker.

From Wikipedia:  The Old Spanish Trail is a historical trade route which connected the northern New Mexico settlements near or in Santa Fe, New Mexico with that of Los Angeles, California and southern California. Approximately 1,200 mi (1,900 km) long, it ran through areas of high mountains, arid deserts, and deep canyons. It is considered one of the most arduous of all trade routes ever established in the United States. Explored, in part, by Spanish explorers as early as the late 1500s, the Trail saw extensive use by pack trains from about 1830 until the mid-1850s.

Galen giving the marker some scale.