The Smithsonian American Art Museum has a wonderful collection of landscape paintings. Some are huge and majestic with towering waterfalls and rocky cliffs. Others, like Thomas Wilmer Dewing's The Hermit Thrush (1890) bring out nature's subtlety. I love that the women are so absorbed in their surroundings that they physically melt right into the field they're standing in.
Of course, knowing what a Hermit Thrush actually sounds like adds a whole new dimension to the painting: