[Nepperhan Avenue tunnel under Old Croton Aqueduct.]

[Embankment of Old Croton Aqueduct.]

[Embankment of Old Croton Aqueduct.]

[Embankment of the Old Croton Aqueduct.]

[West side of embankment of Old Croton Aqueduct.]

[Embankment of Old Croton Aqueduct over Pocantico River.]

[Embankment of Old Croton Aqueduct over Barney Brook.]

[Embankment of Old Croton Aqueduct looking north east.]

[Embankment of Old Croton Aqueduct over Pocantico River.]

Croton Aqueduct

The Holland Tunnel

[The Holland Tunnel.]

[Old Croton Aqueduct arch at Ossining, N. Y.]

[Lane on top of the Old Croton Aqueduct embankment.]

Hudson River Tunnel Curve, New York

Interior of Holland Tunnel, New York City

[Holland Tunnel.]

Holland Tunnel from New Jersey

Hudson River Tunnel Curve, New York.

McAdoo Tunnel under North River, New York