| name | discoverer | image | geology | type | Area (m²) | elevation (m) | Range | date discovered | Depth (m) | Height (m) | city | Website | administrative división | continent | Country | latitude (°) | Width (m) | Length (m) | longitude (°) | Map |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Mark Twain Cave | Hannibal, Missouri | website | Missouri | Americas | United States | 39.6833343506 | -91.3166656494 | Map |