GPS: Your GPS may name the city as Loudon instead of Philadelphia. This is fine, it is still the same place.
From Knoxville, I-40 West to I-75 South:
I-75 S, Exit 72 Loudon. Turn left onto Hwy. Travel 2.47 miles to Right on US 11 (W Lee Hwy). Travel 2.15 miles to Nightfall Acres entrance on right.
From Chattanooga, I-75 North:
I-75 N, Exit 68 Philadelphia. Turn Right onto SR 323. Travel 2.02 to Left on US 11 (W Lee Hwy). Travel 1.27 to Nightfall Acres entrance on left.