17.  Carlsbad Caverns, New Mexico

 

The country’s most popular underground cave network has roughly 400,000 visitors swarming to it each year. The 119 beautiful caves as a result of sulphuric acid dissolving the region’s limestone, thus leading to formations of all types, colors, and sizes. Explore the stunning undersea world of the cave’s popular Big Room section that’s teeming with natural stalactite and stalagmite creations.

18.  Lockport Cave, New York

 

For almost 15 years workers blasted through the rock to create this impressive 2,000-foot cave beneath the city of Lockport in the state of New York. Opened in the 1850s, this man-made chamber was originally meant to move water from the Erie Canal to various industries located in New York. An underground boat ride is usually available here. Walking tours are available.

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