Buildings, objects, landscapes, and other cultural assets of historical value are the focus of historic preservation (US), built heritage preservation (UK), or built heritage conservation (AU). This philosophical idea gained traction in the 20th century and holds that modern cities, the culmination of centuries of growth, have a responsibility to preserve their historical and cultural resources. To be clear, this phrase is only used about the built environment and does not include maintaining natural areas such as virgin forests or wilderness. Laws, regulations, and standards issued at the federal, state, and local levels in the United States drive over 70% of the professional, paid practice in historic preservation. Many state laws either directly reference or create similar regulations based on the federal government's National Historic Preservation Act of 1966 and associated regulations, such as Section 106 (54 USC 306108, formerly known as 36 CFR 800), the National Register of Historic Places (54 USC 302101-302108), and the Secretary of the Interior's Standards (36 CFR 67).

• Princeton University
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