Camino Real de Tierra Adentro
northernmost of Mexico City‘s four "royal roads"
Camino Real de Tierra Adentro is the historic silver mining route established by Spanish settlers in the 16th century. It begins in downtown Mexico City and runs through the several states in Mexico for 1,400 kilometers (870 miles) before crossing what is now the United States border at Juarez/El Paso and extending 650 km (404 miles) north to Santa Fe where it ends at San Juan Pueblo. Camino Real de Tierra Adentro is a UNESCO World Heritage Site.

The entire designated area of the route spans 2,600 km. The Mexican portion of the site is administered for the federal government by the INAH (Instituto Nacional de Antropologia y Historia), this portion includes 5 previously declared World Heritage Sites and adds an additional 55 as part of the Camino Real. The U.S. portion of the route is administered for the federal government by the Department of the Interior, NPS (National Park Service) and Bureau of Land Management (BLM); the U.S. portion does not inscribe specific sites, but includes historic areas of Santa Fe, including other designated trails.