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  1. Blue Ridge Summit is an unincorporated community and census-designated place in Franklin County, Pennsylvania, United States, southwest of Gettysburg in the central part of the state, adjoining Pennsylvania's southern border with Maryland. It is less than 3 miles (5 km) east of Pen Mar, Maryland.

  2. The Raven Rock Mountain Complex ( RRMC ), also known as Site R, is a U.S. military installation with an underground nuclear bunker near Blue Ridge Summit, Pennsylvania, at Raven Rock Mountain that has been called an "underground Pentagon ". [3] [4] [5] : 2 The bunker has emergency operations centers for the United States Army, Navy, Air Force ...

  3. Blue Ridge Summit is an unincorporated community and census-designated place in Franklin County, Pennsylvania, United States, southwest of Gettysburg in the central part of the state, adjoining Pennsylvania's southern border with Maryland. It is less than 3 miles (5 km) east of Pen Mar, Maryland.

  4. The ridge of Blue Mountain runs for 150 miles (240 km) through Pennsylvania, reaching an elevation of 2,270 feet (690 m) above sea level just north of the Pennsylvania Turnpike, near the borough of Newburg.

  5. Type of rock. granite, gneiss and limestone. The Blue Ridge Mountains are a physiographic province of the larger Appalachian Highlands range. The mountain range is located in the Eastern United States and extends 550 miles southwest from southern Pennsylvania through Maryland, West Virginia, Virginia, North Carolina, South Carolina, Tennessee ...