Henryton State Hospital

Henryton is an unincorporated community in Carroll County, Maryland, United States. It is located along the Patapsco River.

The Henryton Tunnel, located near Henryton in southern Carroll County, Maryland, is the third-oldest tunnel in the world that remains in active railroad use. Constructed by the Baltimore and Ohio (B&O) Railroad and opened around 1850, it was the first tunnel constructed on the B&O's Old Main Line. In 1865 the tunnel was widened to accommodate double track. It was rebuilt into its current form in 1903. The tunnel has brick portals and lining. The coping and footings are concrete.: 452 

Marriottsville is an unincorporated community in Howard, Carroll and Baltimore counties, Maryland, United States. Marriottsville is located along Marriottsville Road near the Carroll County line, 10.3 miles (16.6 km) north-northwest of Columbia.

Ivy Hill is a historic home and farm and plantation located in Marriottsville, Howard County, Maryland. The property was part of General William Hammond Marriott's property. Marriott would later become Speaker of the Maryland House of Delegates in 1822. During the Civil War the farm was searched as the potential hiding place of 1st Maryland Infantry, CSA General Bradley Tyler Johnson, who was in the attic at the nearby Mt. Pleasant Farm.

Howard Lodge is a historic plantation house in north-central Howard County, Maryland. The main house, built around 1750 by Edward Dorsey, son of John Dorsey, is one of the oldest plantation houses in the county. Compared to other houses of the period, the two-story brick and stone structure is larger and its interior finishes better preserved. The surviving plantation property, about 15 acres (6.1 ha), also includes early 19th-century stone outbuildings. Edward Dorsey was given ownership of seven African-American slaves by his father John Dorsey.The property was listed on the National Register of Historic Places in 2012.

Salopha or Solopha is a historic plantation house located in Sykesville, Howard County, Maryland.Salopha is a historic house, farm and bank barn. The farm house is built around a log house constructed in 1718 that predates the land grant patented to John Johnson in September 18, 1742. In 1762 Vachel Dorsey expanded the structure. The property was purchased in 1829 by Charles Alexander Warfield for $2,400 (~$74,723 in 2022). In 1889 the house was modified in a Gothic revival style. The home is the birthplace of former Carroll County commissioner Joshua Warfield Dorsey Sr. The bank barn built by the Warfield brothers in 1889 burned in 1972.

Henryton Heights is an unincorporated community in Howard County, Maryland, United States.

The Shipley House was located in Alpha, Howard County, Maryland, near Marriottsville. The house was among five other buildings supporting a farm in Alpha, Maryland. The 55-acre (22 ha) property was part of a 3,440-acre (1,390 ha) land grant named Woodford patented in 1727. John Taylor acquired the land and 2,707 acres (1,095 ha) of the estate were sold to Phillip Hammond in 1744. In 1777, Charles Hammond bequeathed 1,500 acres (610 ha) of Woodford and his slaves to his son. Nathan Shipley acquired a portion and through inheritance, Joshua H. Shipley acquired 77 acres (31 ha) of the Woodford estate, raising 12 children on-site. The slave plantation harvested tobacco and grain crops. The frame farm house was constructed in 1830. Outbuildings included a wellhouse (1900), a frame shed (1835), and a bank barn (1884). John and Mary O'Mara farmed and maintained the property as Sunnyside Farm, raising hoses and cattle until sale in 1979. The farm was purchased by Howard County in 1979 as possible expansion space for the controversial Alpha Ridge Landfill project. The county boarded up the properties without maintenance. In August 1992, the firm of Goodwin and Associates determined that the deterioration that occurred in twelve years of ownership by Howard County negated any effort to preserve the property. The land was converted to the Alpha Ridge Community Park in 1994, demolishing the Shipley House and outbuildings to replace them with a complex of revenue generating ball fields and facilities.

Alpha is an unincorporated community in Howard County, Maryland, United States. A postal office operated from 27 February 1884 to 15 June 1915.Alpha is the site of the Mt. View Cemetery. The town between Marriottsville, and Sykesville is not recognized by the name, but is dominated by the controversial Alpha Ridge Landfill. It was home to one of Howard County's earliest bicycle clubs active in 1891.

The original log section of the Moses Brown House was built about 1785, with a stone addition dating to about 1814. The house illustrates a transition in construction practice and style, with the much larger, later addition reflecting a higher level of detail and sophistication.The Moses Brown House listed on the National Register of Historic Places in 1977.

Marriotts Ridge High School is a public High School located in Marriottsville, Maryland, United States. It is part of the Howard County Public School System. The school was named after the town of Marriottsville, and the height of its location. The pre-opening name of Marriott's Ridge was later changed to Marriotts Ridge.The school is located in northern Howard County on Maryland Route 99, just east of Maryland Route 32, and north of Interstate 70. It is approximately 15 miles west of Baltimore and 25 miles north of Washington, DC. The school was planned to be built on the grounds of the Alpha Ridge Landfill, but a 3–2 council vote in 2002 redirected the building to a site across from Mount View Middle School. Marriotts Ridge is a mirror image of both Long Reach High School and Reservoir High School. The school borders the districts for Glenelg High School, River Hill High School, Wilde Lake High School, Centennial High School, and Mount Hebron High School. In 2015, U.S. News & World Report ranked Marriotts Ridge as the No. 265 best high school nationwide and No.7 statewide on its list of "America's Best High Schools".

Forest View is a historic building located near Marriottsville, Howard County, Maryland, United States. The farm on which this house was built was a speculative venture that was begun 1860–1861, which was rare for that time period. In time production at the farm ended and the property was subdivided. Unlike many Howard County farms that suffered the same fate, the house was preserved. It is a 2½-story frame structure with a kitchen wing that extends out the back of the house. The original block was built in 1861, and additions have subsequently been added to the house including a second story over the kitchen wing. The Gothic Revival decorative features were added in the late 19th or early 20th century. The house's final form was realized about 1936. It was listed on the National Register of Historic Places in 2017.