Welcome to the 2025 Taconic Region NYS Park Summer Geocaching Challenge. Please see OL 1 for details about the challenge.
“Niagara” (1857) depicts the iconic American landmark, Niagara Falls. It currently is housed at the National Gallery of Art in Washington, D.C. Here Church captured the power and beauty of the falls. https://www.nga.gov/collection/art-object-page.166436.html
You are looking for a medium lock-and-lock.