Maryland's state and national parks protect a wide array of ecosystems, from Appalachian peaks to barrier islands.
- **Assateague Island National Seashore**: Famous for its herds of wild, free-roaming horses, pristine beaches, and salt marshes. - **Catoctin Mountain Park**: A forested ridge in north-central Maryland that offers scenic vistas, tranquil streams, and is home to Camp David, the U.S. presidential retreat. - **Patapsco Valley State Park**: Stretching along the Patapsco River, it offers miles of trails, waterfalls, and historic ruins just minutes from Baltimore. - **Gunpowder Falls State Park**: One of Maryland's largest state parks, known for varied topography, fly-fishing, and extensive hiking trail networks.