Top Ten U.S. Caves

Yours 'til Niagara falls (Niagara Falls)

Niagara Cave, one of the Midwest's largest limestone caverns, offers such notable underground sights as Paul Bunyan's Bed, a wishing well, an echo chamber, and the Wedding Chapel—over 300 ceremonies have been performed in the latter. At the cavern's lowest level, the Stalactite Room holds a rainbow of rock formations in a massive chamber.

Carved out by underground streams, Niagara Cave's ceiling reaches over a hundred feet high, with deep canyons and gorges below. Many of these streams are still active today, one of which tumbles for 60 feet—the cave's namesake waterfall.

Just the Facts

Open: Hours vary by season; regular season is May through September

Cave temperature: 48 degrees Fahrenheit year-round

Location: Southeast Minnesota, on the Iowa border, outside of Harmony, MN

For more information: Call Niagara Cave at (800) 837-6606 or visit www.niagaracave.com