Vintage sepia drawing of a boathouse on a mountain lake. With a large tree in the foreground and mountain peaks in the background, this vintage building image is in the public domain.
This is one of a number of drawings that I found in Handbook of Drawing by William Walker (b. 1821). It was published in 1880.
This image is copyright free and in the public domain anywhere that extends copyrights 70 years after death or at least 120 years after publication when the original illustrator is unknown.