A listing on the National Register of Historic Places is a governmental acknowledgment of a historic district, site, building, or property. However, the Register is mostly "an honorary status with some federal financial incentives". The National Register of Historic Places automatically includes all
National Historic Landmarks as well as all historic areas administered by the National Park Service, Some states and municipalities, however, may have laws that become effective when a property is listed in the National Register. If federal money or a federal permitting process is involved, Section 106 of the
National Historic Preservation Act of 1966 is invoked. Section 106 requires the federal agency involved to assess the effect of its actions on historic resources. A salient example of a successful 106 Review was the early 1970s review of the Department of Transportation's proposal to tunnel under Baltimore's historic
Federal Hill neighborhood with a 14 lane highway, the 106 Review, and the highway's ultimate rerouting and reduction in size -- as well as provision of a buffer park, what became Baltimore's
Robert Baker Park. Statutorily, the
Advisory Council on Historic Preservation (ACHP) has the most significant role by Section 106 of the National Historic Preservation Act. The section requires that the director of any federal agency with direct or indirect jurisdiction of a project that may affect a property listed or determined eligible for listing in the National Register of Historic Places must first report to the
Advisory Council. The director of said agency is required to "take into account the effect of the undertaking" on the National Register property, as well as to afford the ACHP a reasonable opportunity to comment. While Section 106 does not mandate explicitly that any federal agency director accept the advice of the ACHP, their advice has a practical influence, especially given the statutory obligations of the NHPA that require federal agencies to "take into account the effect of the undertaking". The
Department of Transportation Act, passed on October 15, 1966, the same day as the National Historic Preservation Act, included provisions that addressed historic preservation. The DOT Act is much more general than Section 106 NHPA in that it refers to properties other than those listed in the Register.
Types of properties in
Enfield, New Hampshire, built 1854, listed with NRHP Listed properties are generally in one of five broad categories, although there are special considerations for other types of properties that in anyone, or into more specialized subcategories. The five general categories for National Register properties are: building, structure, site, district and object. In addition, historic districts consist of contributing and non-contributing properties. Buildings, as defined by the National Register, are distinguished in the traditional sense. Examples include a house, barn, hotel, church, or similar construction. They are created primarily to shelter human activity. The term building, as in outbuilding, can be used to refer to historically and functionally related units, such as a courthouse and a jail or a barn and a house. Structures differ from buildings in that they are functional constructions meant to be used for purposes other than sheltering human activity. Examples include an aircraft, a
grain elevator, a
gazebo and a bridge. Objects are usually artistic in nature, or small in scale compared to structures and buildings. Although objects may be movable, they are generally associated with a specific setting or environment. Examples of objects include monuments, sculptures and fountains. Sites are the locations of significant events, which can be prehistoric or historic in nature and represent activities or buildings (standing, ruined, or vanished). When sites are listed, it is the locations themselves that are of historical interest. They possess cultural or archaeological value regardless of the value of any structures that currently exist at the locations. Examples of types of sites include
shipwrecks,
battlefields,
campsites, natural features and
rock shelters.
Historic districts possess a concentration, association, or continuity of the other four types of properties. Objects, structures, buildings and sites in a historic district are united historically or aesthetically, either by choice or by the nature of their development. There are several other different types of historic preservation associated with the properties of the National Register of Historic Places that cannot be classified as either simple buildings or historic districts. Through the National Park Service, the National Register of Historic Places publishes a series of bulletins designed to aid in evaluating and applying the criteria for evaluation of different types of properties. Although the criteria are always the same, the manner they are applied may differ slightly, depending upon the type of property involved. The National Register bulletins describe the application of the criteria for aids to navigation, historic battlefields, archaeological sites, aviation properties, cemeteries and burial places,
historic designed landscapes, mining sites, post offices, properties associated with significant persons, properties achieving significance within the last fifty years, rural historic landscapes,
traditional cultural properties and vessels and shipwrecks. ==Property owner incentives==