Union Mills, Maryland

Union Mills Homestead Historic District is a national historic district at Westminster, Carroll County, Maryland, United States.

Deep Run is a tributary of Big Pipe Creek in Carroll County, Maryland in the United States.

Silver Run is an unincorporated community in Carroll County, Maryland, United States.Christopher Erb House was listed on the National Register of Historic Places in 1985.

Philip and Uriah Arter Farm is a historic home and farm complex located at Union Mills, Carroll County, Maryland. The complex includes a frame house built about 1844, a frame bank barn built about 1888, and a deteriorated early-20th-century frame outbuilding. The house is a well-preserved example of a middling farmer's dwelling house from mid-19th-century Maryland.It was listed on the National Register of Historic Places in 2006.

The Solomon Arter House is a historic two-story, three-bay log home in Union Mills, Carroll County, Maryland, United States. It was built in about 1810 by Solomon Arter, a member of the Arter family that was prominent in the Pennsylvania German culture of this region. The structure is representative of Pennsylvania German domestic architecture in Carroll County, and is significant for the preservation of its interior stenciling. Also on the property is an 1872 bank barn, hogpen, and 1883 frame Victorian tenant house.The Solomon Arter House was listed on the National Register of Historic Places in 1987.The house lies outside area of the proposed Union Mills Reservoir.

Deep Run is an unincorporated community in Carroll County, Maryland, United States. Deep Run is located 7.6 miles (12.2 km) north of Westminster.

Pleasant Valley is an unincorporated community in Carroll County, Maryland, United States. Pleasant Valley also has a Volunteer Fire Company, which hosts many county events throughout the year.

Bear Branch Nature Center is a nature center in Carroll County, Maryland near Westminster. It features interpretive exhibits about local plants and animals, an outdoor water feature and play area, a Discovery Room for children, an observation beehive, live animals including an eagle, hawks, owls, snakes, salamanders, turtles, frogs, and toads, a planetarium and observatory. The center is a facility of Carroll County Recreation & Parks. The nature center is adjacent to Hashawha Environmental Center, a residential facility that is also operated by Carroll County Recreation & Parks. Hashawha Environmental Center is home to Carroll County Public Schools' Outdoor School, a residential environmental education program open to every sixth grade student in the county. The two facilities are located on approximately 320 acres, with more than five miles of multi-use trails, a restored 19th century cabin, a lake, a pond, and access to both Bear Branch and Big Pipe Creek.

The Whittaker Chambers Farm, also known as the Pipe Creek Farm, is a historic cluster of farm properties near Westminster in rural Carroll County, Maryland. The farm's historic significance comes from its ownership by Whittaker Chambers (1901-1961), a pivotal figure in American Cold War politics. In December 1948, Chambers hid the "Pumpkin Papers" (microfilm) while awaiting a subpoena from the House Un-American Activities Committee to relinquish any intelligence stolen from the US Government by members of the Soviet spy rings within the federal government (e.g., Alger Hiss). Chambers also wrote his best-selling 1952 memoir Witness there. The property was designated a National Historic Landmark in 1988, in a somewhat controversial decision. The property remains in the Chambers family and is not accessible to the public.

Slagle-Byers House is a historic home located at Westminster, Carroll County, Maryland. It is a two-story gable-roofed Flemish bond brick structure with a two-story rear wing. It was constructed about 1819.It was listed on the National Register of Historic Places in 2007.