Keywords: Cortlandthenge.JPG en Looking south along a row of thirteen mysterious structures between the Old Putnam Railroad and the great lawn of Van Cortlandt Park Early 20th century stone testing site for GCT <ref>http //www forgotten-ny com/SUBWAYS/Putnam 20Branch 20page/putnam html Forgotten New York Old Putnam Railroad</ref> Own Jim henderson 2009-04-02 40 53 4611 0 N 73 53 4635 0 W alt 0_source exif_heading SSW References reflist Materials test Rail transport in New York City Van Cortlandt Park New York Putnam rail trails |