Appropriately enough, it's a place called Midway Island, which is part of the Marine Corps Base at Quantico. You may want to stop before the base at Triangle, VA. It's the home of the National Museum of the Marine Corps if that holds any interest.
About 130 miles.
Towson, MD
It is 43 miles taking SUITLAND PARKWAY, from D.C., to MD-4 SOUTH, and then MD-4 SOUTH to Prince Frederick.
Richmond, VA
The distance between Phoenix, AZ, and Frederick, MD, is 2,292 miles and will take about 34 Hours to drive.
Procious
According to trueknowledge.com, it is 43.5 miles from Frederick, MD to Baltimore, MD.
The town that is roughly midway between Annapolis, MD, and Newark, DE, is Middletown, DE. Located along Route 301, Middletown serves as a convenient stopping point for travelers between these two locations. It's known for its small-town charm and growing community.
Youngdale, PA is your halfway point.
about 50 miles
The closest town in Virginia to Frederick, MD, is Berryville. Located about 20 miles southwest of Frederick, Berryville is easily accessible via Route 7. Its proximity makes it a convenient destination for those traveling between Maryland and Virginia.
Unionville, PA