Caves
US - Blair County
| Name | Length | Depth |
|---|---|---|
| Tytoona Cave | 1 km | 30 m |
| Arch Spring Cave | 643 m | 32 m |
| Heller Cave New Entrance | 455 m | 37 m |
| Heller Cave Original Entrance | 455 m | 37 m |
| Heller Cave Pit Entrance | 455 m | 37 m |
| Blue Hole Cave #1 | 366 m | 0 m |
| Canoe Creek Mine #2 | 152 m | 0 m |
| Carl's Bad Cavern | 122 m | 0 m |
| Field Trip Cave | 116 m | 11 m |
| Gromiller Cave #1 | 105 m | 0 m |
| Thomas Quarry Cave #3 | 76 m | 0 m |
| Razor Cave | 72 m | 5 m |
| Jones-Weaver Cave | 54 m | 16 m |
| Waterfall Cave | 54 m | 9 m |
| Ganister Cave #3 | 53 m | 4 m |
| Hollidaysburg Cave #1 | 46 m | 3 m |
| Keystone Zinc Mine #1 | 44 m | 12 m |
| Thomas Quarry Cave #2 | 37 m | 23 m |
| Ironville Cave | 34 m | 3 m |
| Road Cut Cave | 30 m | 0 m |
| Turkey Valley Cave #1 | 24 m | 0 m |
| Smith Cave | 14 m | 16 m |
| Tytoona Cavelet | 13 m | 9 m |
| Frankstown Cave | 12 m | 0 m |
| Logan Cave | 9 m | 0 m |
| Chimney Rock Cave | 6 m | 0 m |
| Arch Spring Cave #4 | 0 m | |
| Arch Spring Cave #5 | 0 m | |
| Arch Spring Cave #6 | 0 m | |
| Arch Spring Church Caves | 0 m | |
| Connie's Pit | 0 m | |
| Elk Run Caves | 0 m | |
| McKee Quarry Cave | 0 m | |
| Price's Cave | 0 m | |
| Promised Land Cave #2 | 0 m | |
| Suick Cave | 0 m | |
| Thomas Quarry Cave #4 | 0 m | |
| Treese Cave | 0 m | |
| Birmingham Crawlway Cave | 0 m | |
| Railroad Cave | 0 m |