- Niagara Cave
- 29842 County Road 30
- Harmony, MN 55939
- Phone: (507) 886-6066
- Toll-free: (800) 837-6606
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One of the most fascinating and unique geological attractions in the United States. During the one hour, one mile, guided tour visitors will witness an underground stream leading to a waterfall nearly 60 feet high, stalactites - both delicate and massive, calcite flowstone, several fossils that have been dated to over 400 million years old, and a wedding chapel in which over 400 weddings have been performed, and more. Rated one of the top ten caves in the country. Open seasonal hours.