Anji Martin (Wedding P.
Google
There are a lot of great locations on the National Mall for wedding and engagement portraits, but Constitution Gardens might well be the best one. It gives you the main thing you want when you do a photoshoot on the Mall -- glorious views of DC's most famous landmarks. From the island in the middle of Constitution Gardens' pond, you can see the Washington Monument rising in the background nearby. At the same time, this location gives you a nature-y vibe that you don't get elsewhere. The aforementioned island has a really lovely willow tree that gives a bit of shade and adds a splash of color to the portraits. There's also a few cherry blossom trees not far from the pond, so you have the option of including those in your photos in the spring. Overall a great spot for wedding and engagement pictures!
Please note that because the National Park Service administers this land, permits are required for all commercial photoshoots.