Heritage Documentation Programs administers the Historic American Buildings Survey (HABS), the Federal Government's oldest preservation program, and its companion programs: the Historic American Engineering Record (HAER) and Historic American Landscapes Survey (HALS). Documentation produced through the programs constitutes the nation's largest archive of historic architectural, engineering, and landscape documentation. The HABS/HAER/HALS Collection is housed at the Library of Congress.

The Cities and Buildings Database is a collection of digitized images of buildings and cities drawn from across time and throughout the world.

An open access, intellectual resource focused on architecture, urbanism, environmental and landscape design, visual culture, and conservation issues related to the Muslim world.

A typologically organized archive of digital images with accompanying educational materials. The initial component of Catena is built around the villa, an important landscape type in garden history. Serves as an educational tool for teachers and scholars of landscape history affiliated with schools and universities. The images and intellectual content on this site should be used for educational purposes only.