The National Register of Historic Places (NRHP) is the United States federal government's official list of districts, sites, buildings, structures and objects deemed worthy of preservation for their historical significance or "great artistic value". A property listed in the National Register, or located within a National Register Historic District, may qualify for tax incentives derived from the total value of expenses incurred in preserving the property.
A National Historic Landmark (NHL) is a building, district, object, site, or structure that is officially recognized by the United States government for its outstanding historical significance. Only some 2,500 (~3%) of over 90,000 places listed on the country's National Register of Historic Places are recognized as National Historic Landmarks.
This is a list of properties and historic districts in Washington that are listed on the National Register of Historic Places. There are at least three listings in each of Washington's 39 counties.
This is intended to be a complete list of properties and districts listed on the National Register of Historic Places in Columbia County, New York. Seven properties and districts are further designated National Historic Landmarks.
The following list presents the full set of National Register of Historic Places listings in Multnomah County, Oregon. However, please see separate articles for listings in each of Portland's six quadrants.
This is a list of the National Register of Historic Places listings in Richland County, South Carolina.
This is a list of the National Register of Historic Places listings in Columbia County, Pennsylvania.
This is a list of the National Register of Historic Places listings in Columbia County, Florida.
This is a list of the National Register of Historic Places listings in Columbia, South Carolina.
This is a list of the National Register of Historic Places listings in Buffalo, New York.
Engine Company 23 is a fire station and a historic structure located in the Foggy Bottom neighborhood of Washington, D.C. The two-story Italianate style building was a collaboration of the Washington, D.C. architectural firm of Hornblower & Marshall and District of Columbia Municipal Architect Snowden Ashford. It was built in 1910. The exterior of the structure features segmental-arched vehicle openings and quoined limestone frontispiece. It was listed on both the District of Columbia Inventory of Historic Sites in 2005 and on the National Register of Historic Places in 2007. The building sits on the campus of the George Washington University near Kogan Plaza.
