MetroWest Water Supply Tunnel

The John J. Carroll Water Treatment Plant (CWTP) is a water treatment plant operated since 2005 by the Massachusetts Water Resources Authority (MWRA) to treat water bound for Greater Boston. The plant is located at the town lines of Marlborough, Northborough, and Southborough, Massachusetts.

Advanced Math and Science Academy Charter School (AMSA) is a charter school founded in 2005. It is located at 201 Forest Street in Marlborough, Massachusetts, U.S., in a few remodeled office buildings. The school is widely recognized for its academic achievements, consistently scoring in the highest percentile among Massachusetts schools in the English, math and science MCAS exams. In 2018, U.S. News & World Report ranked the school the #2 high school in Massachusetts.As a charter public school, AMSA receives funding from the Commonwealth of Massachusetts. Students and their families have no direct costs other than uniforms and the fees for extra activities that have become common among most of Massachusetts' public schools. Admission includes completing an application, attending an open house, and taking math and language arts tests that are solely used to determine placement in the right level of classes. Preference for the limited spaces is given first to siblings of current students regardless of residence, then to residents of Marlborough, Hudson, Clinton, and Maynard, and finally to any resident of Massachusetts. The school is currently divided into a Lower School (grades 6-8) and an Upper School (grades 9-12) thus making a distinction between two parts of one continuous school.

The State Reform School for boys in Westborough Massachusetts was a state institution for the reformation of juvenile offenders from 1848 to 1884. Originally conceived the facility was built to house up to 300 young boys but by 1852 an addition was added to house an additional 300 inmates. By 1857, there were 614 inmates at the reform school. After a devastating fire in 1859, that consumed half of the building and was set by one of the inmates, the school created a nautical branch to house some of the older boys on school ships. The youngest boys were housed in an old mill in the nearby village while some remained in what was left of the Reform School. By 1861 what was left of the Reform School was rebuilt and 3 "trust houses" were built, each holding approximately 30 boys. The "trust houses" as an experiment in juvenile reform in which boys were placed in a family setting known as the "cottage system". By 1872, the nautical branch was disbanded and in 1877 a "correctional" addition was added to the original building to house the older boys. After a riot broke out in 1877, information leaked to the media about cruel and unnecessarily severe punishment of the boys. Legislative hearings were held and the abuses uncovered were denounced by many in the public. By 1880 the legislature, having deemed the Reform School a failed experiment in a congregate setting, and needing additional space for an overcrowded institutional system for the insane, used the land and the buildings to establish the Westborough Insane Hospital. By 1884, the State Reform School for Boys was relocated a couple of miles away, in Westborough, and renamed the Lyman School for Boys being established under the "cottage system". It is widely written that the Reform School for Boys in Westborough was the first juvenile reform school to be built in the United States. This is somewhat misleading as there were several reform schools built before 1848 including; The Boston Farm School (1833) and the New York House of Refuge (1824) that were either private or corporate institutions. The State Reform School for Boys in Westborough is believed to be the oldest publicly funded reform school in the United States.

Westborough State Hospital, originally "Westborough Insane Hospital", was a historic hospital in Westborough, Massachusetts, which sat on more than 600 acres (240 ha). The core campus area was located between Lyman Street and Chauncy Lake, north of Massachusetts Route 9. The hospital was added to the National Register of Historic Places in 1994. The hospital was established in 1884 on the grounds of the State Reform School for Boys. The existing buildings were renovated to accommodate the needs of a mental hospital and was opened on December 1, 1886. This was the first homeopathic hospital for the insane established in New England; but such hospitals existed in New York, Michigan, and perhaps other states.The pioneering African-American psychiatrist Solomon Carter Fuller spent the majority of his career practicing at the hospital in the early 1900s. While there, he performed his ground-breaking research on the physical changes to the brains of Alzheimer's disease patients. The hospital was closed in 2010, in anticipation of a new Worcester State Hospital opening in 2012. The ten-bed Deaf Unit, the two Adolescent Units, and the Intensive Residential Treatment Program (one step below State Hospital Level) programs were closed by June 2010.On May 9, 2015, a memorial service was held in nearby Pine Grove Cemetery for the more than 500 patients who died at Westborough State Hospital and whose remains were unclaimed and subsequently buried in a potter's field. The service was part of a larger effort to put names to the graves of the deceased. Despite being on the historic register, the entire hospital complex was demolished during the summer of 2019. A senior living complex is currently being built at the same location as the state hospital was.

Algonquin Regional High School is a public high school located in Northborough, Massachusetts, United States. The school serves the students of the Northborough-Southborough Regional School District (NSRSD) comprising both Northborough and neighboring Southborough. The school's mascot, as of February 11, 2022, is the Titan. The former mascot was the Tomahawk, known by many as the "T-Hawk." On April 28, 2021, the Northborough-Southborough Regional School Committee voted, 9-0, to retire the Tomahawk as its mascot. A study group was assembled to determine a new mascot, which was voted on by the student body at that time. The school's colors are maroon and gold. Algonquin Regional's Superintendent is Greg Martineau and its Principal is Sean Bevan.

The Capt. Peter Rice House is a historic First Period house at 377 Elm Street in Marlborough, Massachusetts. The oldest portion of this house, a two-room section, dates to 1688, and was built by Peter Rice around the time of his marriage to Rebecca Howe. It was expanded over the 18th century to its present configuration, a five-bay 2+1⁄2-story saltbox with a large central chimney. The house now serves as the headquarters of the Marlborough Historical Society.The house was added to the National Register of Historic Places in 1980.

Brigham Cemetery is a historic cemetery off West Main Street near Crescent Street in Marlborough, Massachusetts. The small cemetery's first burial was in 1793, and is significant as the city's burial ground for early victims of smallpox. Its burials also include veterans of the American Revolutionary War and the American Civil War. The cemetery was listed on the National Register of Historic Places in 2004. Its last burial was in 1934.

The J.D.C. Bradley House, also known as Oakcrest, is a historic mansion at 5 Sadie Hutt Lane in Southborough, Massachusetts. Built in 1913, the massive, 15,000-square-foot (1,400 m2) stucco house is one of the finest surviving works of architect Charles Adams Platt in Massachusetts. The house was listed on the National Register of Historic Places in 1999, where it is listed at 60 Sears Road.

The West Main Street Historic District of Marlborough, Massachusetts encompasses a residential area west of the city center. It extends along West Main Street from Mechanic Street to Gibbon Street, along Pleasant Street from West Main to Lincoln Street, and also includes short pieces of Witherbee and Winthrop Streets abutting West Main. Most of the buildings in the district are houses built between 1820 and 1930, the period of the city's growth as an industrial center. The 15-acre (6.1 ha) district includes 77 properties, all but two of which contribute to its historic significance. The district was listed on the National Register of Historic Places in 2001.

Massachusetts International Academy (Simplified Chinese: 美国麻省国际学院, Traditional Chinese: 美國麻省國際學院, Pinyin: Měiguó Máshěng Guójì Xuéyuàn) is a college preparatory school positioning high school and university graduates from China for success in United States’ colleges and universities located in Marlborough, Massachusetts. It is the first boarding school designed for Chinese students who intend to attend U.S. universities. MAIA has closed its Marlborough campus (in part, due to COVID-19) as of June 2020.

The Pleasant Street Historic District is a predominantly residential historic district at 187—235 Pleasant Street in Marlborough, Massachusetts. It is a cohesive collection of 8 residences and one school building that are representative of upper class housing on large well-proportioned lots. The oldest house in the district was built c. 1865, the newest c. 1924. A number of 19th century houses were restyled during the 1920s. The Immaculate Conception School was built in 1961, and does not contribute to the area's historic significance. The district was added to the National Register of Historic Places in 2001.The Pleasant Street area was developed as an upper-class residential area for leaders in Marlborough's dominant shoe manufacturing industry. Members of the Howe and Frye families contributed several of the houses. Louis Howe, who began manufacturing shoes in 1850, built a substantial Second Empire house at 207 Pleasant c. 1865, which was updated to the Colonial Revival by his nephew in the 1920s. Louis Howe's cousin Franklin built 207 Pleasant c. 1872; it was a companion Second Empire house, which was given Georgian Revival styling in 1927 by John Frye, who grew up next door.Three other houses were built in the 19th century, all with Queen Anne styling. The Russell House at 208 Pleasant was built c. 1885, and has a wraparound porch and bargeboard decoration in its gables. This house, like several of the others in the district, has been converted to multi-unit housing. The Walter Frye House at 187 Pleasant was built c. 1895, and has characteristic Queen Anne features, with numerous projections and gables, as well as a wraparound porch with octagonal pavilion and porte cochere. The Frye-Hazelton House at 223 Pleasant was also built c. 1895, and features a prominent octagonal tower.

Marlborough is a city in Middlesex County, Massachusetts, United States. The population was 41,793 at the 2020 census. Marlborough became a prosperous industrial town in the 19th century and made the transition to high technology industry in the late 20th century after the construction of the Massachusetts Turnpike. Marlborough was declared a town in 1660. It was incorporated as a city in 1890 when it changed its municipal charter from a New England town meeting system to a mayor–council government.