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Situated near the Potomac River and Franklin Roosevelt Memorial, the grassy sitting area of the park offers great views of Washington, D.C. There's also free parking. Source: https://www.thepicnicworld.com/best-picnic-spots/

West Potomac Park Washington

Picnic Sites Around the United States.
Whether you enjoy sitting atop the cliffs of Malibu to watch the sun set over the Pacific Ocean or appreciate the quiet beauty of Lake Calhoun in Minnesota, the varied geography around the country ensures there's a picnic spot that fits your personality. https://www.thepicnicworld.com/best-picnic-spots/