| … |
Chesapeake & Ohio Canal |
| … |
Georgetown Reservoir and Washington Aqueduct |
| … |
Chesapeake & Ohio Canal |
| … |
Chesapeake & Ohio Canal |
| … |
Chesapeake & Ohio Canal |
| … |
Chesapeake & Ohio Canal |
| … |
Chesapeake & Ohio Canal |
| … |
Chesapeake & Ohio Canal |
| … |
Chesapeake & Ohio Canal |
| … |
Chesapeake & Ohio Canal |