Mammoth Spring is Arkansas's largest spring and the second largest spring in the Ozark Mountains. A National Natural Landmark, the spring flows nine million gallons of water hourly. Forming a scenic 10-acre lake, it then flows south as the Spring River, a popular Ozark trout and float stream. Located near the spring, the park's 1886 Frisco depot will take you back in time to an early 1900s train station. Parked just outside the train station is a Frisco caboose to explore
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Blanchard Springs Cavern in Arkansas. is the largest State Park held Caverns in the United States. It is a pretty good trek through. Around 3-5 miles if you do the whole thing. It is incredibly beautiful. Very well preserved and kept. Kudos to State of Arkansas.