Northern section of land tunnel.

[Shaft of Ashokan Water Tunnel.]

[Tunnel construction.]

[Holland Tunnel.]

[McAdoo Tunnel.]

[Subway tunnel.]

Railroad tunnels and bridge, south of Central Avenue.

[Man shaping a horseshoe.]

[North tunnel shield.]

[McAdoo Tunnel.]

[Tunnel construction.]

[Man putting horseshoe on a horse.]

Unidentified tunnel.

Unidentified tunnel.

Unidentified track tunnel.

Man inside the southern end of a river tunnel.

The Holland Tunnel

[Holland Tunnel.]

[Holland Tunnel.]

[Constructing the McAdoo Tunnel.]