Documenting America's Built Environment

The Heritage Documentation Programs (HDP) consist of the Historic American Buildings Survey (HABS), Historic American Engineering Record (HAER), and Historic American Landscapes Survey (HALS). The programs document historic sites and structures across the United States through the creation of measured drawings, large-format photographs, and historical reports. Documentation is archived in the HABS/HAER/HALS Collection at the Library of Congress and is available to the public without restriction. HDP is part of the National Park Service’s Cultural Resources, Partnerships, and Science Directorate.

Tile staircase with curved wrought-iron hand rail

Learn about HDP, HABS, HAER, and HALS

Front facade of light blue house with white trim and details

How to create HABS/HAER/HALS documentation

Interior of modern living room with furniture around stone fireplace
Submit Documentation

How to submit HABS/HAER/HALS documentation

Red and white generators inside hydroelectric powerhouse
Our Work

HDP projects and publications

Concrete arch bridge spanning a river
Internships & Fellowships

Student employment opportunities

Orange dune buggy

Enter HDP's documentation contests

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Virtual Content

Virtual tours of historic sites across the country

Fountain surrounded by flowers in a garden

Explore the HABS/HAER/HALS Collection

Two-track dirt road through wooden fence with cabin in background

Contact HDP or an NPS regional office

Last updated: October 31, 2023