The caverns are technically a limestone cave and were formed because of the erosive properties of water. You can visit them any time of the year because the caverns remain a consistent 52 degrees F. inside. You may want to bring a light jacket or sweater when touring them, along with comfortable walking shoes.
Please note: You can NOT take backpacks or bags with you on the tour. You can take cameras with or without flash and video cameras along with you. In addition, you can not take food or water on the tour. If you're taking little ones with you on the tour, you'll need to leave diaper bags, baby gear and strollers in your car.
Once your done with your tour...you can do a little souvenir shopping at the gift shop or have a little fun at Gem Mill Junction where kids can try their hand at finding gemstones. This is a seasonal attraction, so check their web site for the operating schedule. In addition, this costs an additional, but reasonable fee.
We love visiting Indian Echo Caverns and it's a very popular tourist attraction here in south central Pennsylvania. If you are going to be visiting Hershey, Lancaster, Gettysburg or Harrisburg it's definitely a must-see and do attraction.