Taos Pueblo is a World Heritage Site, and believed to be the oldest continuously inhabited structure in North America.  The core of the present adobe complex was probably initially built between 1000 and 1450 A.D. 

The church of San Geronimo de Taos, shown at the bottom, is the third church built on the site, and dates to 1850 (although the Spanish first assigned a missionary priest to Taos Pueblo in 1598).