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Cape Hatteras Lighthouse, Oil House, 46379 Lighthouse Road, Buxton, Dare County, NC

Significance: The Oil House at the Cape Hatteras Light Station was constructed in 1892 (at the same time as the addition to the nearby Double Keeper's Quarters) in order to store oil for the adjacent Lighthouse More

United States Soldiers' and Airmen's Home National Cemetery, Main Gate, 21 Harewood Road Northwest, Washington, District of Columbia, DC

Significance: The Main Gate, erected as a simple yet elegant, classically inspired colonnade, was built in 1883-84 to form the ceremonial entrance into what was then referred to as the Soldiers' Home National More

Andrew Carnegie Mansion, Pergola, 2 East 91st Street, New York County, NY

Significance: Andrew Carnegie, nineteenth-century industrial magnate and philanthropist, built a sixty-four room mansion from 1899 to 1902 on a large lot encompassed by 90th Street, 91st Street, and Fifth Avenu More

Cape Lookout Light Station, Lighthouse, Cape Lookout, Carteret County, NC

Significance: Constructed between 1857 and 1859, the Cape Lookout Lighthouse is significant as the prototype of all lighthouses to be erected on the Outer Banks of North Carolina. The Cape Lookout Lighthouse wa More

Arlington National Cemetery, McClellan Gate, McClellan Drive, Arlington, Arlington County, Virginia

Significance: McClellan Gate was constructed in 1871-72 as the ceremonial entryway into the original 200-acre Arlington National Cemetery. Created in 1864 from part of the Arlington estate appropriated from Con More

Bloede Dam, Spanning Patapsco River, Avalon, Baltimore County, MD

Significance: In 1907, the Patapsco Electric and Manufacturing Company contracted Ambursen Hydraulic Construction Company to build the Bloede Dam using Nils F. Ambursen's patent. The proposed dam would generate More

United States Soldiers' and Airmen's Home National Cemetery, Main Gate, 21 Harewood Road Northwest, Washington, District of Columbia, DC

Significance: The Main Gate, erected as a simple yet elegant, classically inspired colonnade, was built in 1883-84 to form the ceremonial entrance into what was then referred to as the Soldiers' Home National More

Andrew Carnegie Mansion, Pergola, 2 East 91st Street, New York County, NY

Significance: Andrew Carnegie, nineteenth-century industrial magnate and philanthropist, built a sixty-four room mansion from 1899 to 1902 on a large lot encompassed by 90th Street, 91st Street, and Fifth Avenu More

Arlington National Cemetery, McClellan Gate, McClellan Drive, Arlington, Arlington County, Virginia

Significance: McClellan Gate was constructed in 1871-72 as the ceremonial entryway into the original 200-acre Arlington National Cemetery. Created in 1864 from part of the Arlington estate appropriated from Con More

Cape Lookout Light Station, Lighthouse, Cape Lookout, Carteret County, NC

Significance: Constructed between 1857 and 1859, the Cape Lookout Lighthouse is significant as the prototype of all lighthouses to be erected on the Outer Banks of North Carolina. The Cape Lookout Lighthouse wa More

Bloede Dam, Spanning Patapsco River, Avalon, Baltimore County, MD

Significance: In 1907, the Patapsco Electric and Manufacturing Company contracted Ambursen Hydraulic Construction Company to build the Bloede Dam using Nils F. Ambursen's patent. The proposed dam would generate More

United States Soldiers' and Airmen's Home National Cemetery, Main Gate, 21 Harewood Road Northwest, Washington, District of Columbia, DC

Significance: The Main Gate, erected as a simple yet elegant, classically inspired colonnade, was built in 1883-84 to form the ceremonial entrance into what was then referred to as the Soldiers' Home National More

Andrew Carnegie Mansion, Pergola, 2 East 91st Street, New York County, NY

Significance: Andrew Carnegie, nineteenth-century industrial magnate and philanthropist, built a sixty-four room mansion from 1899 to 1902 on a large lot encompassed by 90th Street, 91st Street, and Fifth Avenu More

Arlington National Cemetery, McClellan Gate, McClellan Drive, Arlington, Arlington County, Virginia

Significance: McClellan Gate was constructed in 1871-72 as the ceremonial entryway into the original 200-acre Arlington National Cemetery. Created in 1864 from part of the Arlington estate appropriated from Con More

Cape Lookout Light Station, Lighthouse, Cape Lookout, Carteret County, NC

Significance: Constructed between 1857 and 1859, the Cape Lookout Lighthouse is significant as the prototype of all lighthouses to be erected on the Outer Banks of North Carolina. The Cape Lookout Lighthouse wa More

Bloede Dam, Spanning Patapsco River, Avalon, Baltimore County, MD

Significance: In 1907, the Patapsco Electric and Manufacturing Company contracted Ambursen Hydraulic Construction Company to build the Bloede Dam using Nils F. Ambursen's patent. The proposed dam would generate More

United States Soldiers' and Airmen's Home National Cemetery, Main Gate, 21 Harewood Road Northwest, Washington, District of Columbia, DC

Significance: The Main Gate, erected as a simple yet elegant, classically inspired colonnade, was built in 1883-84 to form the ceremonial entrance into what was then referred to as the Soldiers' Home National More

Andrew Carnegie Mansion, Pergola, 2 East 91st Street, New York County, NY

Significance: Andrew Carnegie, nineteenth-century industrial magnate and philanthropist, built a sixty-four room mansion from 1899 to 1902 on a large lot encompassed by 90th Street, 91st Street, and Fifth Avenu More

Cape Lookout Light Station, Lighthouse, Cape Lookout, Carteret County, NC

Significance: Constructed between 1857 and 1859, the Cape Lookout Lighthouse is significant as the prototype of all lighthouses to be erected on the Outer Banks of North Carolina. The Cape Lookout Lighthouse wa More

Arlington National Cemetery, McClellan Gate, McClellan Drive, Arlington, Arlington County, Virginia

Significance: McClellan Gate was constructed in 1871-72 as the ceremonial entryway into the original 200-acre Arlington National Cemetery. Created in 1864 from part of the Arlington estate appropriated from Con More

Bloede Dam, Spanning Patapsco River, Avalon, Baltimore County, MD

Significance: In 1907, the Patapsco Electric and Manufacturing Company contracted Ambursen Hydraulic Construction Company to build the Bloede Dam using Nils F. Ambursen's patent. The proposed dam would generate More

United States Soldiers' and Airmen's Home National Cemetery, Main Gate, 21 Harewood Road Northwest, Washington, District of Columbia, DC

Significance: The Main Gate, erected as a simple yet elegant, classically inspired colonnade, was built in 1883-84 to form the ceremonial entrance into what was then referred to as the Soldiers' Home National More

Arlington National Cemetery, McClellan Gate, McClellan Drive, Arlington, Arlington County, Virginia

Significance: McClellan Gate was constructed in 1871-72 as the ceremonial entryway into the original 200-acre Arlington National Cemetery. Created in 1864 from part of the Arlington estate appropriated from Con More

Cape Lookout Light Station, Lighthouse, Cape Lookout, Carteret County, NC

Significance: Constructed between 1857 and 1859, the Cape Lookout Lighthouse is significant as the prototype of all lighthouses to be erected on the Outer Banks of North Carolina. The Cape Lookout Lighthouse wa More

Bloede Dam, Spanning Patapsco River, Avalon, Baltimore County, MD

Significance: In 1907, the Patapsco Electric and Manufacturing Company contracted Ambursen Hydraulic Construction Company to build the Bloede Dam using Nils F. Ambursen's patent. The proposed dam would generate More

United States Soldiers' and Airmen's Home National Cemetery, Main Gate, 21 Harewood Road Northwest, Washington, District of Columbia, DC

Significance: The Main Gate, erected as a simple yet elegant, classically inspired colonnade, was built in 1883-84 to form the ceremonial entrance into what was then referred to as the Soldiers' Home National More

Bloede Dam, Spanning Patapsco River, Avalon, Baltimore County, MD

Significance: In 1907, the Patapsco Electric and Manufacturing Company contracted Ambursen Hydraulic Construction Company to build the Bloede Dam using Nils F. Ambursen's patent. The proposed dam would generate More

Bloede Dam, Spanning Patapsco River, Avalon, Baltimore County, MD

Significance: In 1907, the Patapsco Electric and Manufacturing Company contracted Ambursen Hydraulic Construction Company to build the Bloede Dam using Nils F. Ambursen's patent. The proposed dam would generate More

Bloede Dam, Spanning Patapsco River, Avalon, Baltimore County, MD

Significance: In 1907, the Patapsco Electric and Manufacturing Company contracted Ambursen Hydraulic Construction Company to build the Bloede Dam using Nils F. Ambursen's patent. The proposed dam would generate More

Bloede Dam, Spanning Patapsco River, Avalon, Baltimore County, MD

Significance: In 1907, the Patapsco Electric and Manufacturing Company contracted Ambursen Hydraulic Construction Company to build the Bloede Dam using Nils F. Ambursen's patent. The proposed dam would generate More

Bloede Dam, Spanning Patapsco River, Avalon, Baltimore County, MD

Significance: In 1907, the Patapsco Electric and Manufacturing Company contracted Ambursen Hydraulic Construction Company to build the Bloede Dam using Nils F. Ambursen's patent. The proposed dam would generate More

Bloede Dam, Spanning Patapsco River, Avalon, Baltimore County, MD

Significance: In 1907, the Patapsco Electric and Manufacturing Company contracted Ambursen Hydraulic Construction Company to build the Bloede Dam using Nils F. Ambursen's patent. The proposed dam would generate More

Bloede Dam, Spanning Patapsco River, Avalon, Baltimore County, MD

Significance: In 1907, the Patapsco Electric and Manufacturing Company contracted Ambursen Hydraulic Construction Company to build the Bloede Dam using Nils F. Ambursen's patent. The proposed dam would generate More