Wonderland Cave, in the community of Bella Vista about 9 miles west of Pea Ridge, is the largest cave in northwestern Arkansas. It's a show cave in the traditional sense — guided tours, formations with whimsical names, theatrical lighting — but the cave itself is genuinely large and the formations are good. Tours run about an hour and cover around half a mile of developed passage.
The cave's unusual history as a Jazz Age dance hall gives it a more interesting backstory than most similar attractions. The entrance building dates from the 1920s and is listed on the National Register of Historic Places. This is a reasonable addition to a day at Pea Ridge battlefield for visitors who want variety.