Merkle Wildlife Sanctuary and Visitor's Center is a protected area in the state of Maryland.
Antietam National Battlefield • Chesapeake and Ohio Canal National Historical Park • Clara Barton National Historic Site • Fort McHenry National Monument and Historic Shrine • Hampton National Historic Site • Monocacy National Battlefield • Thomas Stone National Historic Site
Catoctin Mountain Park • Fort Foote Park • Fort Washington Park • Glen Echo Park • Greenbelt Park • Harmony Hall • Oxon Cove Park and Oxon Hill Farm • Piscataway Park
Appalachian Trail • Captain John Smith Chesapeake National Historic Trail •
Assateague • Big Run • Bill Burton Fishing Pier State Park • Calvert Cliffs • Casselman River Bridge • Chapel Point • Cunningham Falls • Dans Mountain • Deep Creek Lake • Elk Neck • Fort Frederick • Fort Tonoloway • Gambrill • Gathland • Greenbrier • Greenwell • Gunpowder Falls • Hart-Miller Island • Herrington Manor • Janes Island • Jonas Green • Martinak • Matapeake • New Germany • North Point • Palmer • Patapsco Valley • Patuxent River • Pocomoke River • Point Lookout • Purse • Rocks • Rocky Gap • Rosaryville • Sandy Point • Seneca Creek • Smallwood • South Mountain • St. Clement's Island • St. Mary's River • Susquehanna • Swallow Falls • Tuckahoe • Washington Monument • Wye Oak
Cedarville • Chesapeake • Doncaster • Elk Neck • Garrett • Green Ridge • Pocomoke • Potomac-Garrett • Savage River • Seth • Stoney • Wicomico
Avondale • Belle Grove • Billmeyer • Bowen • Cedar Island • Cedar Point • Cheltenham • Chicamuxen • Dan's Mountain • Deal Island • Diersson • E.A. Vaughn • Earlville • Ellis Bay • Fairmount • Fishing Bay • Frederick City Watershed • Grove Farm • Gwynnbrook • Heater's Island • Hugg-Thomas • Idylwild • Indian Springs • Islands of the Potomac • Isle of Wight • Johnson • Le Compte • Linkwood • McKee-Beshers • Maryland Marine Properties • Millington • Mt. Nebo • Myrtle Grove • Nanticoke River • Old Bohemia • Pocomoke River • Prather’s Neck • Pocomoke Sound • Sideling Hill • Sinepuxent Bay • South Marsh • Strider • Taylors Island • Warrior Mountain • Wellington
Belt Woods • Dundee • Governor Parris N. Glendening • Mattawoman • Morgan Run • Severn Run • Soldiers Delight • Zekiah Swamp
Battle Creek Cypress Swamp Sanctuary • Merkle Wildlife Sanctuary • Sherwood Gardens • Somers Cove Marina • Sugarloaf Mountain • Western Maryland Rail Trail • Youghiogheny Scenic & Wild River