[McAdoo Tunnel.]

[Constructing the McAdoo Tunnel.]

[McAdoo Tunnel.]

[McAdoo Tunnel.]

[McAdoo Tunnel.]

[McAdoo Tunnel.]

McAdoo Tunnel under North River, New York

Building the McAdoo Tunnel, Under the Hudson River, New York.

[William McAdoo.]

[Cheering parade of delegates after nominating McAdoo for president.]

[Tunnel construction.]

[Holland Tunnel.]

[Subway tunnel.]

[Tunnel construction.]

[North tunnel shield.]

Unidentified tunnel.

Unidentified tunnel.

The Holland Tunnel

[Holland Tunnel.]

Unidentified track tunnel.