Where: Spruce Creek, Huntingdon County, on state Route 45, 10 miles west of Pine Grove Mills.
Known for: American Indian artifacts, formations such as the two-story flowstone, annual Halloween tour.
When: June through August, 10 a.m. to 5 p.m. daily, Memorial Day through Labor Day weekends; 10 a.m. to 5 p.m. Saturdays and Sundays in April, May, September and October. Closed November through March except for groups of 10 or more with reservations.
Admission: adults, $13; seniors, students and military, $11; children age 4 to 12, $7 (including panning for gemstones activity); children 3 and younger, free.
Information: 632-7578 or 570-772 6199 or www.indiancaverns.com
LINCOLN CAVERNS AND WHISPER ROCKS
Where: three miles west of Huntingdon on U.S. Route 22.
Known for: educational programs; Halloween tour; geological program for Girl and Boy Scouts, Kids Cave Kamp and Ultimate Underground Birthday.
When: 9 a.m. to 6 p.m. July 1 to Labor Day; 9 a.m. to 5 p.m. Memorial Day weekend to June 30; 9 a.m. to 4 p.m. March-May and September-November; weekends only in December; January and February by appointment; closed Thanksgiving and Christmas.
Cost: adults, $13.98; seniors 65 and older with ID, $12.98; children 4-12 $7.98, tour only, and $13.48, tour and panning for gems; children 3 and younger, free.
Information: 643-0268 or www.lincolncaverns.com
Where: five miles east of Centre Hall on state Route 192.
Known for: All-water cavern and native North American wildlife park; two separate fully guided tours of cavern, given entirely by motorboat; and farm, nature and wildlife tours given by bus or four-wheel vehicle.
When: 9 a.m.-7 p.m. June-August; 9 a.m.-5 p.m. September, October, April and May; 10 a.m.-5 p.m. November and March; 11 a.m.-5 p.m. weekends only, December and February; closed January, Thanksgiving Day, Christmas.
Cavern tour admission: adults, $17.95; seniors age 65 and older, $16.95; children 2-12, $9.75; children younger than 2, free.
Wildlife tour admission: adults, $21.00; seniors 65 and older, $20.00; children 2-12, $12.75; children younger than 2, free.
Discounts are available when taking both tours on same day.
Information: 364-1664 or www.pennscave.com
Where: off state Route 45, 26 miles east of State College.
Known for: cavern tours; campground with rental cabins; lodge for parties: gift shop and picnic grounds.
When: open daily in spring and summer until Aug. 28; check website for hours before visiting. Open weekends 10 a.m.-4 p.m.. Aug. 29-Oct. 12., including Labor Day. Winter tours by appointment. Flashlight tours are available for groups.
Admission: adults, $11; children 4-12, $5.50; children 4 and younger, free.
Information: 349-9800 or www.woodwardcave.com