Lambertville High School

A Real Picture Postcard sent in 1906 from Hattie, age 16, to her big sister Maud who was living in Netcong, NJ.

From Wikipedia:

Lambertville High School, erected in 1854 in Lambertville, New Jersey, was the former home of students of the Lambertville school district. A fire destroyed much of the school in 1926, but it was remodeled and rebuilt in 1927 and used until June 1959, at which time the last senior class graduated. It sat (as some[who?] from the town have stated) like a museum from then on, on top of the hill overlooking Lambertville and the Delaware River.
The school was closed after the 1959 class graduated as it was too small and outdated for the growing area.
The old "school on the hill" was then used as a place to sell electronics for many years, until it eventually sat empty and abandoned (though structurally intact) for over 30 years, until vandals set a fire in 1992 which destroyed most of the building's interior and essentially gutted most of the structure, including the roof.
A June 11, 1959 article in The Hunterdon County Democrat newspaper entitled "Alumni to Gather for Fond Farewell to Lambertville" details the school's closing ceremonies, which consisted of an alumni baseball game, picnic, and concert in the school's auditorium.[1]
The school was demolished in the fall of 2012.