Ellicott City Trolley Trail

The Historical Ellicott City/Baltimore Trolley Line #9 Trail is a 1.25-mile (2.0 km) trail in western Baltimore County, Maryland. It begins at the west end of Edmondson Avenue and extends from Catonsville through Oella to Main Street, Ellicott City. The trail follows what was originally part of the Catonsville and Ellicott City Electric Railway Company trolley line that shuttled passengers between Ellicott City and Baltimore from the late 1890s to the mid-1950s.

Ellicott's Mills Historic District is a national historic district at Oella, Baltimore County, Maryland, United States. It is on the east bank of the Patapsco River, opposite Ellicott City. It relates to the industrial operations of the Ellicott family from the 1770s through the mid-19th century. It consists of the sites of historic buildings including: an 18th-century building, a section of an 18th-century mill incorporated in a 20th-century factory, a 19th-century tavern, 19th-century workers housing, and an 1859 Italianate villa built by John Ellicott, united by the major east–west route in Maryland during the early 19th century, the old National Pike.

Mount Gilboa Chapel is a historic African Methodist Episcopal Church located in Oella, Baltimore County, Maryland. It is a small stone church measuring 28 feet by 42 feet, built about 1859 by free African Americans. The front façade is ashlar masonry, but the sides and rear are of rubble.

George Ellicott House is a historic house located in Oella in Baltimore County, Maryland, United States.George Ellicott was a son of Andrew Ellicott, one of several brothers that founded Ellicott Mills (Ellicott City). George Ellicott bought swampland after the colonial war now known as the Inner Harbor of Baltimore.