Caves
US - Putnam County
| Name | Length | Depth |
|---|---|---|
| Devil's Sink | 0 m | |
| Mahopac Mine | 0 m | |
| Canopus Mine | 0 m | |
| Little Stony Point Cave | 0 m | |
| Croft Mine | 0 m | |
| Pratt Mine | 0 m | |
| Sackett Mine | 0 m | |
| Stewart Mine | 0 m | |
| Brady Farm Shaft Cave | 0 m | |
| Brewster Mines | 0 m | |
| Croton Magnetite Iron Mines | 0 m | |
| Hatfield Adit Mine | 0 m |