Clematis Brook station

The Warren White House is a historic house in Waltham, Massachusetts. The 2+1⁄2-story wood-frame house was built c. 1850–54, and is the oldest surviving house on Warren Street, once an important thoroughfare between Waltham and Belmont. The house has classic Italianate styling, with a symmetrical three-bay facade, wide cornerboards and entablature, and round-arched gable windows. It was built by Warren White, a wheelwright, on land owned by David White, a farmer, who sold Warren White the property in 1855.The house was listed on the National Register of Historic Places in 1989.

The Waltham Land Trust is a private, non-profit corporation that seeks to preserve open space in Waltham, Massachusetts. The trust currently sponsors many projects, including the protection of the grounds of the former Gaebler Children's Center.

The Ephraim Hammond House, also known as Cedar Hill, is a historic house at 265 Beaver Street in Waltham, Massachusetts. The two story wood-frame house was built in 1775, and is Waltham's only side-hall Georgian house. It was added to the National Register of Historic Places in 1989. In the 19th century it became part of the Cedar Hill estate of Cornelia Lyman Warren, after which it was donated to the Massachusetts council of the Girl Scouts of the USA in the early 20th century. The house was restored under the auspices of the Girl Scouts and Helen Storrow, an early leader of the girls' scouting movement, and serves as one of the council's service centers.

The Walter E. Fernald State School, later the Walter E. Fernald Developmental Center, was the Western hemisphere's oldest publicly funded institution serving people with developmental disabilities. Originally a Victorian sanatorium, it became a "poster child" for the American eugenics movement during the 1920s. It later was the scene of medical experiments in the 20th century. Investigations into this research led to new regulations regarding human research in children. The school occupies a 186 acres (75 ha) property off Trapelo Road in Waltham, Massachusetts.

The Jonathan Hammond House is a historic house at 311 Beaver Street in Waltham, Massachusetts. The 2+1⁄2-story wood-frame house was built in 1785 by Jonathan Hammond, member of a prominent local family. The house has transitional late Georgian/early Federal styling, and is one of the more substantial houses of the period to survive in the city. It has also been owned by the Lymans and the Warrens, also locally prominent families.The house was listed on the National Register of Historic Places in 1989. It is now owned by Bentley University and houses some of its offices.

The Henry Stewart House is a historic house at 294 Linden Street in Waltham, Massachusetts. The 2+1⁄2-story brick building was built c.1900–01, and is a rare local example of Jacobethan style. The house was built as the gardener's cottage for Cornelia Warren's Cedar Hill estate. The house was designed by Boston architect John A. Fox. Fox based his design on that of Nun Upton, a 17th-century English country house in Herefordshire near Brimfield which is now a Grade II listed building.The house has a T-shaped plan, with projecting end gables that project upward in curved Flemish styling. The second level above the main entrance is half-timbered wood construction. The walls have highlighting heavy beltcourses, and the chimneys are topped by corbelled pots.The house was listed on the National Register of Historic Places in 1989.

The Joseph Andrews House is a historic house at 258 Linden Street in Waltham, Massachusetts. Built in 1851, it is one of the city's oldest examples of Italianate architecture, and was one of the first houses built in Linden Street. It was listed on the National Register of Historic Places in 1989.

The Frank J. Tyler House is a historic house at 240 Linden Street in Waltham, Massachusetts.

The Dunbar–Stearns House is a historic house at 209 Linden Street in Waltham, Massachusetts. This 2+1⁄2-story wood-frame house was built c. 1846 by Peter Dunbar, and was originally Greek Revival in character. It had a fully pedimented gable, with a single-story porch that was supported by columns that apparently wrapped around the building. The house was purchased in 1892 by Joseph Stearns, who had the house completely remodeled to achieve its present Queen Anne styling. It was enlarged to the sides by incorporating the area of the side porticos, a turret was added to the front, and the pedimented gable was covered with decorative shingle styling. Interior alterations into the new style were equally extensive.The house was listed on the National Register of Historic Places in 1990.

The Robert M. Stark House is a historic house at 176 Main Street in Waltham, Massachusetts. This 2+1⁄2-story house was designed by local architect George Strout, and built in 1890 for Robert Stark, a lawyer and local politician. At the time, the east side of Main Street had become a fashionable address for the upper middle class. The house has high quality Queen Anne style, including various projecting sections and gables, a three-story turret with conical roof, bands of decorative shingles, and windows of varying sizes and shapes with a wide variety of framing treatments.The house was listed on the National Register of Historic Places in 1989.

Gore Place is a historic country house, now a museum, located at 52 Gore Street, Waltham, Massachusetts. It is owned and operated by the nonprofit Gore Place Society. The 45-acre (180,000 m2) estate is open to the public daily without charge; an admission fee is charged for house tours. A number of special events are held throughout the year including an annual sheepshearing festival and a summer concert series. The mansion was built in 1806 as a summer home for Massachusetts lawyer and politician Christopher Gore. In this house the Gores entertained various notables including the Marquis de Lafayette, Daniel Webster, and James Monroe. The property was designated a National Historic Landmark in 1970 in recognition of its architectural significance as a large-scale Federal style country house, and for its well-preserved domestic staff quarters, which illustrate the changing role of domestic labor over time.

A triple homicide was committed in Waltham, Massachusetts, in the United States, on or very near to the evening of September 11, 2011. Brendan Mess, Erik Weissman, and Raphael Teken were murdered in Mess's apartment. All had their throats slit with such great force that they were nearly decapitated. Thousands of dollars' worth of marijuana and money were left covering their mutilated bodies; in all, $5,000 was left in the apartment. The local district attorney said that it appeared that the killer and the victims knew each other, and that the murders were not random. Tamerlan Tsarnaev, the deceased suspect in the 2013 Boston Marathon bombings, had previously described murder victim Brendan Mess as his best friend, though before Mess was murdered there had been animosity between Tsarnaev and Mess over Mess's "lifestyle". After the bombings and subsequent revelations of Tsarnaev's personal life, the Waltham murders case was reexamined in April 2013 with Tsarnaev as a new suspect. Authorities said Tsarnaev and his younger brother Dzhokhar Tsarnaev may have been responsible for the triple homicide, that forensic evidence connected them to the scene of the killings, and that their cell phone records placed them in the area. While police in the first investigation said that victims were killed on September 12, The Boston Globe, Boston Herald, and The Wall Street Journal reported that at least one relative of the victims believes that the killings took place on September 11.In May 2013, Ibragim Todashev, a 27-year-old Chechen native and former mixed martial arts fighter who knew Tamerlan Tsarnaev, was shot and killed in Orlando, Florida, by law enforcement officers who had been interviewing him about the Waltham murders as well as the Boston Marathon bombings. The FBI has alleged that just before he was killed, Todashev made statements implicating both himself and Tamerlan Tsarnaev in the Waltham murders—saying that the initial crime was a drug robbery, and the murders were committed to prevent being identified by the victims.