Linville Caverns – North Carolina’s only show caverns. Open all year, but days and hours vary. Courteous, experienced guides, outstanding gift shop. Located on US 221 between Linville and Marion, just 4 miles south of Parkway Milepost 317.4. Turn left on US 221 toward Linville Falls and Marion. www.linvillecaverns.com Email: firstname.lastname@example.org (800) 419-0540.