Link to the Image Source
Metropolitan Museum of Art

Artwork Details 

Title: Lago Avernus
Dated: ca. 1867–70
Medium: Watercolor, gouache, and graphite on blue woven paper
Dimensions: 4 1/2 x 9 1/2 in. (11.4 x 24.1 cm)
Location: Metropolitan Museum of Art
City, State: New York, NY
Notes:
Morris K. Jesup Fund