Archbald Pothole, PA
Ayres Natural Bridge, WY
Beaver Falls Karst Trail, AK
Big Basin, KS
Bottomless Lakes, NM
Devil’s Millhopper, FL
Devil's Sinkhole, TX
Devil's Well, MO
Falling Waters Sink, FL
Glory Hole Waterfall, AR
Grand Gulf State Park, MO
Ha Ha Tonka State Park, MO
Hamilton Pool, TX
Jemez Soda Dam, NM
Lost Lake, OR
Mackinac Island State Park, MI
McConnell Springs, KY
Montezuma Well, AZ
Nakalele Blowhole, HI
National Corvette Museum, KY
Natural Arch Scenic Area, KY
Alabama's Natural Bridge, AL
Natural Bridge State Resort Park, KY
Needle's Eye, ID
O'Leno State Park, FL
Santa Rosa Blue Hole, NM
Sewanee Natural Bridge, TN
Sinks Canyon SP, WY
Stevens Twin Sinks Preserve, MI
Tonto Natural Bridge, AZ
Twin Arches, TN
Ventana Natural Arch, CO
La Ventana Natural Arch, NM
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