"The Heart of the Andes," Frederic E. Church, 1859, 66-1/8" x 119-1/4" / 168cm x 302.9cm). Entire painting and a detail.
One of my favorite and inspirational paintings in the universe. This sucker is almost 10 feet long; yet, look at all the detail Church painted into the scene. I can't say for sure what the dimensions are of the "detail," but as you can see, he painted every leaf and stem. No blobs of paint that we're supposed to use our imaginations on. Church painted as much detail per unit of measurement as I do, but he did it on big BIG canvases! In fact, paintings like this are what inspired me to work that way.
The plant and animal life are accurate, too. I know some PhD. botanists who love Church's work because they can speciate the plants. This scene is a composite of views from Columbia and Ecuador and shows a number of habitats all at once -- from lowland tropics to the alpine mountain peaks.
So if you ever get to New York, get thee to the Metropolitan Museum of Art where this gem is hanging. Unless they've moved things, "Heart of the Andes" is directly opposite Albert Bierstadt's "Rocky Mountains."