First Baptist Church of Ossining, 1 Church Street.
Brooklyn architect J. Walsh designed this High Victorian Gothic structure, built on the site where the church had stood since 1815.
The 1874 church features many triangles and quatrefoils in its decoration, representing the Trinity and four Gospels respectively.
It is home to Ossining's oldest congregation, established in the 1780s by founding settler Elijah Hunter.
Almost a century later, in 1973, it became Ossining's first property listed on the National Register.

Highland Cottage, 36 S. Highland Ave.
This 1872 Gothic structure was the first concrete house in the county.
Later it was used as a business school.

Old Croton Aqueduct, space between 165 and 173 Main Street.
The 5-by-7-foot (1.5 by 2.1 m) masonry tunnel 20 feet (6.1 m) below ground is topped with a walkway (not considered a contributing structure itself since it is too new), paved with brick within the downtown area, that leads north to Croton Dam.
An engineering accomplishment when it was built in the late 1830s, it was New York City's first clean municipal water supply and the first in its extensive network of reservoirs and aqueducts upstate.
Other city aqueducts have since replaced it, but its northern end has been reopened to supply Ossining and other communities at its north end.
It was listed on the Register in 1974 and upgraded to National Historic Landmark status in 1992.
First Baptist Church of Ossining, 1 Church Street. Brooklyn architect J. Walsh designed this High Victorian Gothic structure, built on the site where the church had stood since 1815. The 1874 church features many triangles and quatrefoils in its decoration, representing the Trinity and four Gospels respectively. It is home to Ossining's oldest congregation, established in the 1780s by founding settler Elijah Hunter. Almost a century later, in 1973, it became Ossining's first property listed on the National Register.
Highland Cottage, 36 S. Highland Ave. This 1872 Gothic structure was the first concrete house in the county. Later it was used as a business school.
Old Croton Aqueduct, space between 165 and 173 Main Street. The 5-by-7-foot (1.5 by 2.1 m) masonry tunnel 20 feet (6.1 m) below ground is topped with a walkway (not considered a contributing structure itself since it is too new), paved with brick within the downtown area, that leads north to Croton Dam. An engineering accomplishment when it was built in the late 1830s, it was New York City's first clean municipal water supply and the first in its extensive network of reservoirs and aqueducts upstate. Other city aqueducts have since replaced it, but its northern end has been reopened to supply Ossining and other communities at its north end. It was listed on the Register in 1974 and upgraded to National Historic Landmark status in 1992.
Downtown Ossining Historic District