Gray Gardens East and West Historic District

Neighborhood Nine, also known as Peabody or Area 9, is a neighborhood of Cambridge, Massachusetts, U.S. It is mostly residential.

The Asa Gray House, recorded in an HABS survey as the Garden House, is a historic house at 88 Garden Street, Cambridge, Massachusetts. A National Historic Landmark, it is notable architecturally as the earliest known work of the designer and architect Ithiel Town, and historically as the residence of several Harvard College luminaries. Its most notable occupant was Asa Gray (1810–88), a leading botanist who published the first complete work on American flora, and was a vigorous defender of the Darwinian theory of evolution.

Hall Tavern is an historic tavern at 20 Gray Gardens West Street in Cambridge, Massachusetts. Now converted to residential use, this two story Federal style wood-frame building was built in sometime in the late 1790s in Duxbury, Massachusetts, and was moved to this location in 1930. The building is one of a number that were moved in order to preserve them in the early decades of the 20th century, and it is now one of the centerpieces of the Gray Gardens subdivision.The building was listed on the National Register of Historic Places in 1983.

The Taylor Square Firehouse is an historic fire station at 113 Garden Street in Cambridge, Massachusetts. The stylistically eclectic brick building was built in 1904 to a design by local architect Charles Greco. Although it has a somewhat standard building plan dictated by its function, the building has exotic architectural details, including a projecting cornice with large wooden brackets, patterned brickwork on the parapet, and Moorish Revival decoration of the truck bay arches. It is the most elaborate of the fire stations built by the city in that period.The building was listed on the National Register of Historic Places in 1982.

Harvard University Press (HUP) is a publishing house established on January 13, 1913, as a division of Harvard University, and focused on academic publishing. It is a member of the Association of American University Presses. After the retirement of William P. Sisler in 2017, the university appointed as Director George Andreou.The press maintains offices in Cambridge, Massachusetts near Harvard Square, and in London, England. The press co-founded the distributor TriLiteral LLC with MIT Press and Yale University Press. TriLiteral was sold to LSC Communications in 2018.Notable authors published by HUP include Eudora Welty, Walter Benjamin, E. O. Wilson, John Rawls, Emily Dickinson, Stephen Jay Gould, Helen Vendler, Carol Gilligan, Amartya Sen, David Blight, Martha Nussbaum, and Thomas Piketty. The Display Room in Harvard Square, dedicated to selling HUP publications, closed on June 17, 2009.

The 1.2 meter Millimeter-Wave Telescope at the Harvard-Smithsonian Center for Astrophysics and its twin instrument at CTIO in Chile have been studying the distribution and properties of molecular clouds in our galaxy and its nearest neighbours since the 1970s. The telescope is nicknamed "The Mini" because of its unusually small size. At the time it was built, it was the smallest radio telescope in the world. Together, "The Mini" and its twin in Chile have obtained what is by far the most extensive, uniform, and widely used galactic survey of interstellar carbon monoxide. "The Mini" is currently in operation from October to May each year.In the early 1970s, an astronomer at the Goddard Institute of Space Studies in New York named Patrick Thaddeus shattered centuries of precedent in the field of astronomy and bucked a trend dating all the way back to Galileo when he decided that, in order to proceed on a modest project to map the entire Milky Way, he simply did not need and in fact refused to use a larger telescope made available for his research. He wanted a small one. In an era made conspicuous by bigger, more sophisticated, and more expensive telescopes, Thaddeus insisted on a small and relatively inexpensive instrument, which he and his colleagues proceeded to build from scratch.

The Harvard College Observatory (HCO) is an institution managing a complex of buildings and multiple instruments used for astronomical research by the Harvard University Department of Astronomy. It is located in Cambridge, Massachusetts, United States, and was founded in 1839. With the Smithsonian Astrophysical Observatory, it forms part of the Harvard–Smithsonian Center for Astrophysics. HCO houses a collection of approximately 500,000 astronomical plates taken between the mid-1880s and 1989 (with a gap from 1953–1968). This 100-year coverage is a unique resource for studying temporal variations in the universe. The Digital Access to a Sky Century @ Harvard project is digitally scanning and archiving these photographic plates.

The Sears Tower—Harvard Observatory is a historic astronomical observatory that is part of Harvard Observatory and is located at 60 Garden Street in Cambridge, Massachusetts. Now just a portion of the observatory's Building A, the Sears Tower is the oldest portion of the complex, designed by Isaiah Rogers and constructed in 1843. This structure is a square brick building, with a projecting cornice and a Greek Revival entrance framed by pilasters. The dome was equipped with a 15-inch telescope, the state of the art at the time.The tower was listed on the National Register of Historic Places in 1987.

The Center for Astrophysics | Harvard & Smithsonian (CfA) is an astrophysics research institute jointly operated by the Harvard College Observatory and Smithsonian Astrophysical Observatory. Founded in 1973 and headquartered in Cambridge, Massachusetts, the CfA leads a broad program of research in astronomy, astrophysics, Earth and space sciences, as well as science education. The CfA either leads or participates in the development and operations of more than fifteen ground- and space-based astronomical research observatories across the electromagnetic spectrum, including the forthcoming Giant Magellan Telescope (GMT) and the Chandra X-ray Observatory, one of NASA's Great Observatories. Hosting more than 850 scientists, engineers, and support staff, the CfA is among the largest astronomical research institutes in the world. Its projects have included Nobel Prize-winning advances in cosmology and high energy astrophysics, the discovery of many exoplanets, and the first image of a black hole. The CfA also serves a major role in the global astrophysics research community: the CfA's Astrophysics Data System (ADS), for example, has been universally adopted as the world's online database of astronomy and physics papers. Known for most of its history as the "Harvard-Smithsonian Center for Astrophysics", the CfA rebranded in 2018 to its current name in an effort to reflect its unique status as a joint collaboration between Harvard University and the Smithsonian Institution. The CfA's current director (since 2004) is Charles R. Alcock, who succeeds Irwin I. Shapiro (Director from 1982 to 2004) and George B. Field (Director from 1973 to 1982).

The Smithsonian Astrophysical Observatory (SAO) is a research institute of the Smithsonian Institution, concentrating on astrophysical studies including galactic and extragalactic astronomy, cosmology, solar, earth and planetary sciences, theory and instrumentation, using observations at wavelengths from the highest energy gamma rays to the radio, along with gravitational waves. Established in Washington, D.C., in 1890, the SAO moved its headquarters in 1955 to Cambridge, Massachusetts, where its research is a collaboration with the Harvard College Observatory (HCO) and the Harvard University Department of Astronomy. In 1973, the Smithsonian and Harvard formalized the collaboration as the Center for Astrophysics | Harvard & Smithsonian (CfA) under a single Director.

The Ash Street Historic District Cambridge, Massachusetts is a residential historic district on Ash Street and Ash Street Place between Brattle and Mount Auburn Streets in Cambridge, Massachusetts, off Brattle Street just west of Harvard Square. The district consists of ten well-preserved houses, most of which were built between 1850 and 1890. The district was listed on the National Register of Historic Places in 1982.

The W. A. Mason House is an historic house at 87 Raymond Street in Cambridge, Massachusetts. The 2+1⁄2-story wood-frame house was built in 1846 and extended to the rear in 1867, giving it a T shape. Its massing is Italianate as are its decorative window hoods, but its corner pilasters give it a Greek Revival character. The main entrance is accessed through a single-story porch occupying the front crook of the T. W. A. Mason, for whom it was built, was a city surveyor who was responsible for surveying and platting a significant amount of the city in the 19th century.The house was listed on the National Register of Historic Places in 1983.