St. Patrick's Church (Lowell, Massachusetts)

The Lowell Power Canal System is the largest power canal system in the United States, at 5.6 miles in length. It is operating through six major canals on two levels, controlled by numerous gates. The system was begun in the 1790s, beginning its life as a transportation canal called the Pawtucket Canal, which was constructed to get logs from New Hampshire down the Merrimack River to shipbuilding centers at Newburyport, Massachusetts, bypassing the 30-plus-foot drop of the Pawtucket Falls. In the early 1820s, Associates of the recently deceased Francis Cabot Lowell bought up the old Pawtucket Canal in what was then East Chelmsford, Massachusetts. Within a few years, the new industrial center that became Lowell was using canals feeding off a widened and deepened Pawtucket Canal as a direct power source for their textile mills. The first of these canals was the Merrimack Canal, which powered the Merrimack Manufacturing Company. The repurposing of the Proprietors of Locks and Canals allowed the Associates to sell water power to other companies, starting with the Hamilton Canal, leading to the explosive growth of the town, and then shortly thereafter, city, of Lowell. By the late 1840s, Lowell's canal system was producing as much power as possible. However, the Chief Engineer of Locks and Canals, an Englishman by the name of James B. Francis devised the Northern Canal and the Moody Street Feeder, to increase the capacity of, and availability of water to various parts of, the whole system. The Pawtucket Gatehouse was constructed to control flow from behind the Pawtucket Dam into the Northern Canal. The dam itself, which was built twenty years earlier, was lengthened at that time, diverting the entire Merrimack (during periods of lower flow) into the two canal system entrances above it. It is a stone dam topped with wooden flashboards – a system still used on this dam today. The level of the water is regulated by the flashboards and the metal pins that hold them back. When there is too much water going over the top of the dam, the pins bend backwards, releasing the boards, and the outflow of the dam is increased. The Gatehouse contains ten wooden gates that control the flow of the Merrimack into the canal. Originally, they were opened by a Francis Turbine, also an invention of James B. Francis. Today, the Gatehouse is controlled electrically and remotely by Boott Hydroelectric, who is partially a continuation of the Proprietors of Locks and Canals, and who operates a 24-megawatt hydroplant on the Northern Canal. The Canal System and the Gatehouse were designated a Historic Civil Engineering Landmark by the ASCE in 1984 and a Historic Mechanical Engineering Landmark by the ASME in 1985 and are part of Lowell National Historical Park. It was added to the National Register of Historic Places in 1976, and declared a National Historic Landmark the next year.

Holy Trinity Greek Orthodox Church is a historic Greek Orthodox Church building at 62 Lewis Street in Lowell, Massachusetts. Holy Trinity is one of the many Eastern Orthodox churches in Lowell, along with St. George Antiochian Orthodox Church, Transfiguration of Our Savior Greek Orthodox Church, and St. George Greek Orthodox Church. The church is under the jurisdiction of the Greek Orthodox Archdiocese of America and is locally administered by the Metropolis of Boston. The church is located the Downtown Lowell neighborhood known as The Acre. It was built in 1906 and added to the National Register of Historic Places in 1977. Holy Trinity was the first church built for a Greek Orthodox congregation in the United States. It is known for its golden dome, mosaics, iconography, and rich history. Archbishop Iakovos of America, who led the Greek Orthodox Archdiocese of America from 1959 through 1996, was ordained as a priest at Holy Trinity on June 16, 1940.

The Whistler House Museum of Art is the birthplace of painter and etcher James McNeill Whistler. It is located at 243 Worthen Street, Lowell, Massachusetts, USA, and is open as a museum displaying works from the museum collection and shows by artist members.

The American Textile History Museum (ATHM), located in Lowell, Massachusetts, was founded as the Merrimack Valley Textile Museum (MVTM) in North Andover, Massachusetts in 1960 by Caroline Stevens Rogers. ATHM told America’s story through the art, science, and history of textiles. In June 2016, the museum closed.The bulk of the library and archives as well as many fabric samples were acquired by Cornell University.

Samuel Pollard Memorial Library or Pollard Memorial Library is the main branch of the public library in Lowell, Massachusetts.

Saint Joseph's Roman Catholic College for Boys, also known as Saint Joseph's High School, is a historic school building at 760 Merrimack Street in Lowell, Massachusetts. The three story brick Romanesque Revival building was built in 1892 to a design by Irish-American church architect Patrick W. Ford. The school was one of a number of Roman Catholic institutions built to serve Lowell's burgeoning French-American community, a significant portion of which had settled in "The Acre", as the neighborhood is known. In 1991 the school was merged with other local Catholic schools to form the Lowell Catholic High School. The diocese sold the building in 1997 to a local nonprofit, which converted it to residential use.The building was listed on the National Register of Historic Places in 2010.

The Wannalancit Mills (formerly the Suffolk Mills) in Lowell, Massachusetts is an early American cotton mill, parts of which date to the 1830s at the earliest. Its namesake is a corruption of Wonalancet, a sachem or sagamore of the Penacook Native American tribe. Today the complex is home to office space, conference center, and university research facilities.

The Merrimack Canal is a power canal in Lowell, Massachusetts. The canal, dug in the 1820s, begins at the Pawtucket Canal just above Swamp Locks, and empties into the Merrimack River near the Boott Cotton Mills. The Merrimack Canal was the first major canal to be dug at Lowell exclusively for power purposes, and delivered 32 feet (9.8 m) of hydraulic head to the mills of the Merrimack Manufacturing Company. The Merrimack Manufacturing Company was the first of the major textile mills constructed in Lowell. It was demolished around 1960. The canal, which runs along the southeast side of Dutton Street and then between the two halves of Lowell High School, is unique in the Lowell Canal System as it delivers the full 32-foot (9.8 m) drop of the Merrimack at once, instead of operating on a 13-foot (4.0 m) and a 17-foot (5.2 m) two-level system.

The City Hall Historic District is a historic district in Lowell, Massachusetts, United States, bound roughly by Broadway, Colburn, and Kirk streets. The centerpiece of the district is the Richardsonian Romanesque City Hall, built in 1893 to a design by Merrill & Cutler, with its 180-foot (55 m) clock tower.The district features Greek Revival and Romanesque Revival architecture, including work by Kirk Boott. City Hall Historic District was added to the National Register of Historic Places in 1975, and expanded in 1988.

The National Streetcar Museum is a streetcar museum and heritage railway located in Lowell, Massachusetts. It is owned by the New England Electric Railway Historical Society, which also operates the Seashore Trolley Museum, and is operated as part of the National Park Service's Lowell National Historical Park.

St. George Antiochian Orthodox Church in Lowell, Massachusetts, is an Eastern Orthodox parish under the jurisdiction of the Antiochian Orthodox Christian Archdiocese of North America. St. George Church is one of several Eastern Orthodox Churches in the city of Lowell, along with Holy Trinity, Transfiguration, and St. George (all of the Greek Orthodox Archdiocese of America).

St. Joseph's Convent and School is a historic convent and school at 517 Moody Street in Lowell, Massachusetts. The school is a three-story brick building built in 1883. Its Italianate styling includes an extended wooden cornice decorated with brackets. The convent, built in 1911, is a modestly-ornmanented Colonial Revival three story brick building. Most of the interiors of the buildings were significantly altered over the course of the 20th century, losing most of their historical integrity; however, a 2001 rehabilitation has reintroduced interior styling in keeping with the age and style of the buildings.The parish of St. Joseph was established in 1868 by the Roman Catholic Archdiocese of Boston, to cater to the religious needs of the burgeoning French-Canadian Catholic population that was one of the significant demographic groups working in Lowell's mills. The school was established by the diocese in 1883 to provide French-language education to the children of these immigrants, with nuns of the Grey Nuns of the Cross as teachers. The nuns initially lived in a house on the property. By the 1890s enrollments had increased such that more space was needed, and the Saint Joseph's Roman Catholic College for Boys was built on Merrimack Street, and this school was devoted to girls. The convent was built in 1911 to provide increased space for housing of the nuns teaching at these facilities. The St. Joseph's school eventually spawned three other Catholic schools in Lowell. However, by the 1980s enrollments had declined, and the school was closed in 1993. The buildings have been rehabilitated by a local nonprofit organization. The buildings were listed on the National Register of Historic Places in 2002.