Not being a gardener, I don't know why azaleas like to grow in the shade.
The flowers are landscaped according to their colors and bloom times. It is not original to say a garden can be like a work of art, but I've seen few examples of the principle in action. The panorama of the azaleas on the hillside is hard to capture in one photo. (Locally, the hill is known as a "mountain." It's not very high in the scheme of things, of course, but it's one of the highest points in D.C. It's a windy, rarefied spot, very removed from the city.)
At the top, through a window in the trees, there's a view of the city and monuments, too hazy to picture.
A wedding this weekend on the Potomac -- a calm section above Great Falls.
The water was so high that ducks alighted in puddles on the lawns.
I'll note in passing that the grounds were luxurious, especially by the standards of a
government-run park; one could find a golf course, cabins with
flat-screen TVs, and a water park with a Rube Goldberg contraption to
pour a bucket of water over the kids, all courtesy of the Northern
Virginia Regional Parks Authority. Next to the cabin phones were directories for the wine country of the Washington, DC area, which I have to admit I've never visited.