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The Hartung–Boothroyd Observatory (HBO) is located atop Mount Pleasant near the Cornell University in Ithaca, New York (US). It is used mainly as a teaching facility for upper-level undergraduate astronomy classes. The observatory is named to recognize funding from M. John Hartung, a 1908 Cornell graduate and later chemical industrialist, and to honor Samuel L. Boothroyd, the founder of Cornell's Department of Astronomy. The facility was designed and directed from 1974-2012 by James R. Houck. The primary 0.6m mirror was constructed from a Pyrex 1/8-scale test pouring as part of technology development for the Palomar Observatory 200-inch telescope. The mirror was polished and mounted in a lightweight tube in the late 1930s under Boothroyd's direction, but World War II deferred its planned use in a high-altitude observatory. This facility, together with an equatorial fork mount to hold the previously completed telescope, was completed in 1974.

Etna (formerly Miller's Settlement and Columbia, sometimes referred to as Aetna) is an unincorporated community in Tompkins County, New York, United States. It lies at an elevation of 1020 feet (311 m).

Dryden is a town in Tompkins County, New York, United States. The population was 14,435 at the 2010 census. The town administers an area that includes two villages, one also named Dryden and one named Freeville, as well as a number of hamlets. The town is on the county's eastern border, east of Ithaca, in the Finger Lakes region.

Virgil Creek is a river located in Tompkins County, New York. It flows into Fall Creek by Freeville, New York.

Mill Creek is a river located in Tompkins County, New York. It flows into Fall Creek by Freeville, New York.

Ellis Methodist Episcopal Church, also known as Ellis Hollow Community Church, is a historic Methodist Episcopal church located at Ellis Hollow in Tompkins County, New York. It was listed on the National Register of Historic Places in 1993.

Freeville is a village in Tompkins County, New York, United States. The population was 520 at the 2010 census. The Village of Freeville is in the Town of Dryden and is east of Ithaca. It is the only incorporated municipality in the United States named Freeville.

Leathers and Associates is an Ithaca-based family-owned playground construction company, best known for having coordinated community-led construction of large wooden playground parks in many towns across the United States during the 1980s and 1990s.

Dryden District School No. 5, also known as Eight Square Schoolhouse, is a historic octagonal school building located in Dryden in Tompkins County, New York. It was built in 1827 and is a simple one-room, one-story, brick octagon style building constructed with a low pitch hipped roof banded by a plain narrow frieze. A circular brick chimney rises from the center of the standing seam metal roof. Also on the property are two free standing, wood frame, gable roofed outhouses. It was used as a school until 1941 and is now a facility of the Dewitt Historical Society.It was listed on the National Register of Historic Places in 1994.

Varna is a hamlet (and census-designated place) located in Tompkins County, New York, United States. It is within the Town of Dryden. Varna is located near the west town line on New York State Route 366 (Dryden Road). Fall Creek flows past the town to Cayuga Lake.

Mud Creek is a river located in Tompkins County, New York. It flows into Fall Creek by Freeville, New York.

West Dryden Methodist Episcopal Church is a historic Methodist Episcopal church located at Dryden in Tompkins County, New York. It is a two-story, frame church structure built in 1832 in the Federal style. It was remodeled during 1870–1890. It features a tower with an octagonal belfry. Since 1966 it has been used as the West Dryden Community Center.It was listed on the National Register of Historic Places in 1991.