Adirondack Architectural Heritage (AARCH) is the nonprofit historic preservation organization for New York State's Adirondack region. AARCH was formed in 1990 with a mission to promote better public understanding, appreciation and stewardship of the Adirondacks unique and diverse architectural heritage. This legacy includes not only the nationally recognized "Great Camps" and other rustic buildings but also the many other structures that embody the whole range of human experience in the region. These other structures include: a wide variety of homes and farmsteads; the churches, commercial buildings, town halls and libraries that make up most Adirondack settlements; bridges, railroad buildings, lighthouses and other transportation related structures; and industrial sites related to the region's important iron, wood, quarrying and tanning industries.