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| Great Falls |
Mather Gorge |
Mather Gorge |
Great Fall Park trail stairs |
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| Wissahickon Formation |
Mather Gorge |
Falls and River Terraces |
Falls and River Terraces |
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| Great Falls |
Great Falls |
Mather Gorge |
Great Falls |
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| Great Falls Visitor Center |
Mather Gorge |
Great Falls |
Falls Overlook |
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| Falls Overlook |
Precambiran rock outcrop |
Falls Overlook |
Great Falls from overlook |
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| Great Falls |
Historic high water marks |
Picknic area trees |
Park trail in snow |
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| Pothole in gneiss |
Mather Gorge |
Pothole in gneiss |
Pothole in gneiss |
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| Mather Gorge |
Mather Gorge |
Historic Patowmack Canal |
3D Photographer Phil |
