My favorite garden at the Minnesota Landscape Aboretum is the Home Prairie Garden. I'm not sure if that's its "real" name, but it's a designed garden - distinct from the actual restored prairie that's across the street.
Without some sort of elevation, it's impossible to get a picture of the entire garden. This is one side of it, with an arbor for some shade.
At the center of the space is a circular garden. Surrounding the garden is rill - a small man-made stream. It's only about 4" wide. In the center are tall liatrus, prairie dropseed, big bluestem and grey-eyed coneflowers.
This is a garden I'd love to duplicate. However, our house is in a heavily wooded area and I'm not sure it would look right. I love it, though.