Why aren’t more Minnesotans talking about this state park?! 🤯 Located in📍Spring Valley, Mystery Cave is the longest underground cave in Minnesota with over 13 miles of underground passages! 🦇 Sign up for a tour (they sell out so book in advance!) to see gorgeous pools and unique rock formations! Comment “MYSTERY” and I’ll send you the link to book a tour! Follow planetwithsara for more Minnesota unique gems #mnstateparks #undergroundcave #exploremn #minnesotalife