Meadowlark Botanical Gardens in Vienna, Virginia. You can get there by taking Beulah Road from Route 7 (Leesburg Pike) or Route 123 (Maple Avenue in Vienna). Gates open at 10 AM. Admittance fee.
Wild buttercups are found throughout Virginia and many other locations in the United States. They produce a thick carpet of yellow.
A Nikon D3 was used with a 70-300mm telephoto to compress the image. Full sun, so flash was not required. Shot at 1/800th of a second at f16 at ISO 800.