Caves and caverns are an affordable option for a summer day trip. All the caves below have tours designed for families, and safety is always the top priority. All you have to do is pick a natural wonder to explore. Be sure to pack a jacket because these caves are known to be chilly! Bluespring Caverns 1459 Bluespring Caverns Rd, Bedford, IN 47421 Below the Bolton Natural Areas lies the vast caverns of Bedford Indiana. The giant sinkhole and underground river are just a few of the unique parts of the Bluespring Cavern. The tours invite you to soak up the majesty of the natural wonder, by spotting a blind cavefish or listening to the rush of the river. Admission: $12 for children ages 3-15 and $20 for adults.\u00a0 Squire Boone Caverns 100 Squire Boone Rd, Mauckport, IN 47142 As the story goes, Squire Boone and his brother, Daniel, discovered these caverns in 1790. Squire later escaped a band of hostile Indians by hiding in the caverns. Today, families can explore the cave and its rushing streams and underground waterfalls, both of which are rare wonders in caves. Admission: $12 for children ages 4-11, $22 for adults ages 12-59, $20 for seniors 60+,\u00a0Children under 4 free Squire Boone Caverns Marengo Cave 400 East State Road 64, Marengo, IN 47140\u00a0 This U.S. National Landmark is definitely one to add to the bucket list! Marengo Cave has been giving tours since its discovery by schoolchildren in 1883. Today, they offer two tours, and both are fun for all ages. In addition to the cave tours, one of the most popular attractions is "The Crawl", which allows kids to feel like they are discovering the cave for the first time! Admission: $10-$13 for children ages 4-12 and $18-$22 for adults 13+, depending on the tour Indiana Caverns 1267 Green Acres Drive SW, Corydon, IN 47112 Explore the Midwest's longest cave! Families can learn about the cave's history during the walking tour, explore the cave on a more in-depth adventure tour (which includes kayaking in the cave!), enjoy a little gemstone mining, ride the Bat Chaser roller coaster, and more. Admission: Varies greatly based on desired activities. Bonus! Mammoth Cave National Park 1 Mammoth Cave Parkway Mammoth Cave, KY 42259 Though not in Indiana, the largest cave in the world is worth the hike to Kentucky. The cave sprawls for over 400 miles, so there are 16 different tours for all ages that cover different aspects of the natural wonder. If you are looking to make this more than a day trip, there are opportunities to camp and explore what lies above Mammoth Cave National Park. Rates vary based on desired tour.