[Answer] Washington, DC, has its fair share of national park sites, and the list includes this 700-acre park containing DC's only remaining tidal marsh.

Step 1 : Introduction to the question "Washington, DC, has its fair share of national park sites, and the list includes this 700-acre park containing DC's only remaining tidal marsh. "

...1. Doncaster Demonstration State Forest 2. Chesapeake & Ohio Canal National Historical Park 3. Blackwater National Wildlife Refuge 4. Kenilworth Park & Aquatic Gardens

Step 2 : Answer to the question "Washington, DC, has its fair share of national park sites, and the list includes this 700-acre park containing DC's only remaining tidal marsh. "

Kenilworth Park & Aquatic Gardens.,:

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