Antietam NB
Sharpsburg, MD

The battlefield is located off route 65 (Hagerstown Pike), just north of Sharpsburg.  The stamp is in the visitor center.

Assateague Island NS
Berlin, MD

The Assateague Island National Seashore has two visitor centers: one  in Virginia and the Barrier Island Visitor Center in Maryland.  It's on route 611, 10 miles south of Ocean City.  You'll find this stamp there.

Baltimore Washington Parkway
Greenbelt, MD

This stamp is kept at the Greenbelt Park Headquarters, along with the stamp for that park.  Ask for it at the reception desk.

Catoctin Mountain Park
Thurmont, MD

The visitor center for Catoctin is right off route 77, a couple miles west of US-15.  The ranger has the stamp inside.

Chesapeake & Ohio Canal NHP
Cumberland, MD

From I-68, take the downtown Cumberland exit  and follow the signs for the historic Cumberland Information Center.  You'll end up at Station Square and the old train depot.  The visitor center in on the north end of the large brick building.  They also have a stamp for the Potomac Heritage National Scenic Trail.

Chesapeake & Ohio Canal NHP
Great Falls, MD

You'll find this stamp at the Great Falls Tavern visitor center at the end of MacArthur Boulevard.  They also have a stamp for the Potomac Heritage National Scenic Trail.

Chesapeake & Ohio Canal NHP
Hancock, MD

The Hancock Visitor Center is located at 326 East Main Street, which also happens to be route 144.  Take exit 3 from I-70 and ride west about 1 mile.  The VC is on the north side of the street.   There is also a stamp for the Potomac Heritage National Scenic Trail here.

Chesapeake & Ohio Canal NHP
Sandy Hook, MD

This stamp is located at the Harper's Ferry visitor center, which is actually in West Virginia.  Take US-340 just a few miles west of the Potomac River.

Chesapeake & Ohio Canal NHP
Sharpsburg, MD

You'll need to go to the C&O Canal NHP Headquarters for this one. Take route 34 west  through Sharpsburg.  Less than 1/2 mile from the river crossing, you'll see a brick entrance on the right.  The stamp is at the visitor information desk, just inside the first building.

Chesapeake & Ohio Canal NHP
Williamsport, MD

The Cushwa Basin is on the eastern shore of the Potomac, right along US-11 before it crosses into West Virginia.  This stamp, along with one for the Potomac Heritage Trail, is located in the large brick building with the name Cushwa painted on the side.

Clara Barton NHS
Glen Echo, MD

The Clara Barton site is open hourly from 10 AM to 4 PM.  The site is just off MacArthur Boulevard.  The stamp is in the bookshop, to the right as you enter the house.  Glen Echo Park is right next door.

Fort Foote Park
Oxon Hill, MD

Fort Foote is located off Fort Foote Road, south of Oxon Hill and the Beltway.  But the stamp is located at Fort Washington Park.

Fort McHenry NM & HS
Baltimore, MD

Take exit 55 from I-95 and then follow the blue and green sign to the Fort.  The stamp is kept by the ranger at the information desk in the visitor center.

Fort Washington Park
Fort Washington, MD

Fort Washington is south of Washington, D.C., on the Maryland shores of the Potomac.  From Route 210 South (Indian Head Highway) turn right onto Fort Washington Road which ends at the park entrance.  The visitor center is at the western end of the park, and the stamp is inside the bookstore.  The Fort Foote Park and Piscataway Park stamps are here also.

Glen Echo Park
Glen Echo, MD

The park is just east of the Clara Barton NHS, off MacArthur Boulevard.  The stamp is kept in the NPS offices, up the ramp, across from the Carousel.

Greenbelt Park
Greenbelt, MD

To get here take exit 23 from I-95.  go south on route 201 (Kenilworth Avenue) and then turn left on route 193 (Greenbelt Road).  Turn right to enter the park, pass the park police building on your right, and then take the first left to get to the Park Headquarters building.  The stamp is kept just inside the door, at the reception desk.

Hampton NHS
Towson, MD

From I-695, take exit 27B north (Dulaney Valley Road) and turn right on Hampton Lane.  The stamp is kept just inside the entrance to the mansion.

Monocacy NB
Frederick, MD

The battlefield is 3 miles south of Frederick on route 355, the Georgetown Pike.  The visitor center is on the lower level of the Gambrill Mill and the stamp is to the right as you enter.

Oxon Cove Park
Oxon Hill, MD

Take exit 3A from I-95/I-495, the Capital Beltway.  Bear right on to Oxon Hill Road and follow the signs.  The stamp is located in the Visitor Barn, a short walk from the parking area. 

Piscataway Park
Accokeek, MD

The stamp is located at Fort Washington Park.  To get to the park take route 210 (Indian Head Highway) south to Bryan's Point Road.  The park is 4 miles ahead, along the Potomac River.

Thomas Stone NHS
Port Tobacco, MD

This site is off Rose Hill Road, between route 6 and route 225.  The visitor center is a long, long walk from the parking lot.  Ask the ranger for the stamp.