This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
Garrison Hill and the Observatory Dover N.H NYPL bGF ZB. en Garrison Hill and the Observatory Dover nypl org Scan by NYPL Garrison Hill and the Observatory Dover Observation towers The Miriam and Ira Wallach Division of Art Prints and Photographs Photography Collection aefccfeaddabc GFZB Robert Dennis collection of stereoscopic views