Bethesda (Ellicott City, Maryland)

The Patapsco Swinging Bridge is located in the Avalon/Orange Grove area of Patapsco Valley State Park in central Maryland, United States. It is a suspension bridge consisting of a wooden deck supported by large cables. The Patapsco Valley has a history of "swinging" bridges built for pedestrian travel from one side of the river to the other. The Orange Grove Flour Mill was one such popular crossing and is where the current bridge now stands. The first bridge was built by the Orange Grove Flour Mill for employees to cross the river. The new swinging bridge, built by the Maryland Department of Natural Resources, is one of the most well known and most popular attractions at the Patapsco Valley State Park.

The Orange Grove Flour Mill was a flour mill established in 1856. It was one of the leading flour mills in the Mid-Atlantic states until it was destroyed in a fire in 1905.

Orange Grove was a town straddling the Patapsco river in Howard County and Baltimore County Maryland, United States The Orange Grove area was the site of two parallel roads running along the Patapsco river settled by the Elliotts in 1762. The road to then North was referred to as "George Washington's Gun Road" as the path of General Lafayette's troops en route to the battle of Yorktown. In 1856, the land was sold by George Elliot for $9,000 to George Worthington and George Baily. They started a construction of a six story mill and sold the property to C.A Gambrill for $45,000. The Gamrill Mill was renamed to Orange Grove producing "Patpasco Superlative Patent" and "Orange Grove" flour. Citizens lived on the Howard County side, using a rope bridge to travel to the mill and B&O railroad siding. In 1869, the mill was purchased by R.G. and P.H. MacGill keeping the name C.A. Gambill & Company, who added steam power in 1873 and modern rollers in 1879. In 1898, the Orange Grove school opened. In 1904, ice stacked up, tearing down the bridge. The same year, the company owned Phoenix mill burned in the great Baltimore fire. On 6 May 1905, the mill and train station burned in a fire started in the engine room monitored by George W. Carr. The town did not recover, and the ruins are part of the Patapsco State Park with a modern suspended bridge along the trail.

Bloede's Dam was a hydroelectric dam on the Patapsco River in Maryland. Built in 1906, it was the first submerged hydroelectric plant—that is, the power plant was housed under the spillway. It was also one of the earliest dams constructed of reinforced concrete. The dam was demolished in 2018 and its site is now part of Patapsco Valley State Park Avalon Area.

Ilchester is an unincorporated community and census-designated place in Howard County, Maryland, United States. The population was 23,476 at the 2010 census. It was named after the village of Ilchester in the English county of Somerset.

The Patterson Viaduct was built by the Baltimore and Ohio Railroad (B&O) as part of its Old Main Line during May to December 1829. The viaduct spanned the Patapsco River at Ilchester, Maryland. It was heavily damaged by a flood in 1868 and subsequently replaced with other structures.

Thistle Manufacturing Company factory was a historic factory located along the Patapsco River, which runs through Catonsville, Maryland across from Ilchester, Maryland. The 1800s factory was in continuous operation until 2003.

St. Marys College was a Roman Catholic school in Ilchester, Maryland (Illchester Mills) near modern Ellicott City, Maryland in Howard County. The ruins are near Ilchester and Bonnie Branch roads. The upper college building was built in 1868 consisting of a cupola topped eighteen bay by five bay building with a five by five bay projection. A three by three bay, five story "L" shaped addition is included, with all of the structure on a stone foundation. A three-story chapel was attached to the building in 1882. In 1934 a fifth floor was added throughout. A statue of Madonna with Child was situated in a niche.

Hilton is a historic home located at The Community College of Baltimore County in Catonsville, Baltimore County, Maryland. It is an early-20th-century Georgian Revival–style mansion created from a stone farmhouse built about 1825, overlooking the Patapsco River valley. The reconstruction was designed by Baltimore architect Edward L. Palmer, Jr. in 1917. The main house is five bays in length, two and a half stories above a high ground floor, with a gambrel roof. The house has a 2+1⁄2-story wing, five bays in length, with a gabled roof, extending from the east end; and a two-story, one-bay west wing. The roof is covered with Vermont slate. The house features a small enclosed porch of the Tuscan order that was probably originally considered a porte cochere.Hilton is situated on the 5000-acre "Taylor's Forest" surveyed in 1678. The first construction at the 511-acre site was a stone farmhouse built between 1818 and 1825 for James W. McCulloh. After defending several charges of conspiracy, the property was sold to John Lewis Buchanan in 1825. In 1827 Dr. Lennox Birckhead, son of McColloh's business partner Soloman Birkhead purchased the property. Birkhead named his home "Hilton" for its high elevation.William Carson Glenn purchased the property in 1837, selling to his politician brother John Glenn in 1842. Guests during this period included Robert E. Lee. In 1852, Glenn added several stone outbuildings. The property passed to Marrietta Glen and was managed by newspaper publisher William Wilkens Glenn. William Glenn managed the farm with 26 slaves, sympathizing with the South during the Civil War. Hilton was used as a stopping location for Southerners fleeing Union troops for home. Glenn died in 1876, with the farm falling into disuse. In 1905 the estate was subdivided into 25 lots. In 1907 43 acres were donated by Russell Sage Foundation director John Mark Glenn (1858–1950) to create the first section of Patapsco Valley State Park. Hilton was purchased in 1917 by National Enameling and Stamping Company owner George Worth Knapp as a summer home and dairy farm reassembling 105 acres of the estate. In 1962 Baltimore County Public Schools purchased the property to establish a Community College of Baltimore County branch. In the 1970s lecture halls occupied the mansion. In 2011, a grant was awarded to renovate the building as the Center for Global Education.In addition to the Hilton Mansion, several other slavery-era outbuildings are on the property: two Tudor style stone houses built in 1852, of which one is in ruins; an 1852 stone bowling alley in ruins; and a stone gardeners building.It was listed on the National Register of Historic Places in 1980.

The Wilderness is a historic home located near Catonsville, Baltimore County, Maryland. It is a large stone and frame house located in a wooded setting west of Catonsville. The original home was built about 1800, and it attained its current appearance following a major expansion in 1899–1900, when it was a summer residence of Francis Cumberland Dugan II (1830-1914). It features multiple roof and dormer shapes and a wraparound porch reminiscent of the Queen Anne style. The third story is located within a tall mansard roof. Also on the property are a stone springhouse / smokehouse, a summer kitchen, log tenant house, and a large frame barn.The house was listed on the National Register of Historic Places in 1985.

Summit is a historic home located in Catonsville, Baltimore County, Maryland. It a large brick house, once part of a country estate owned by James Albert Gary. It features a three-story Italianate tower and large wing extending to the rear. The main façade is three stories and five bays wide, with the tower located on the east side. A one-story porch with square columns and railings runs across the full façade. The mansion was built originally as a summer home and later converted to apartments after its sale to the Summit Park Company in 1919.It was listed on the National Register of Historic Places in 1979.

Central Catonsville and Summit Park Historic District is a national historic district in Catonsville, Baltimore County, Maryland, United States. It is entirely residential and consists generally of rectangular lots, the largest lots being found on Frederick Road and Newburg Avenue. These contain the earliest dwellings. The earliest, and the largest house in the district is the Gary Mansion, known as The Summit, built in the 1850s as a summer house in Second Empire style. The Summit Park subdivision takes its name from this house, and surrounds it on all sides. Structures in the district date from 1869 and extends to 1958, by which date the neighborhood had substantially achieved its present form and appearance.It was added to the National Register of Historic Places in 2006.