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Niagara Cave was discovered in 1924, when three local farm boys lowered themselves into a hole to rescue some lost pigs. After they rescued the pigs, the boys returned to explore the cave. Nearly a decade later, the site was opened for tours and visitors flocked from around the country to tour the cave. Located near the Minnesota-Iowa border and about a half hour from Mystery Cave, Niagara Cave is one of the most unique geographical features in the state. As the name would suggest, the centerpiece of this cave’s one-hour guided tour is a 60 foot underground waterfall that cascades among dramatic stalactites and stalagmites.