Did you know that the Holland Tunnel was named after Clifford Milburn Holland, the chief engineer in charge of its design and construction? Holland was a brilliant young engineer who gave his life for the tunnel.  As construction on the New York and the New Jersey tube neared the joining point beneath the Hudson River, Holland collapsed from exhaustion and died soon after at the age of 41.

Did you know that the tunnel tubes are made of cast iron segments bolted together?  Fourteen of these sections are required to make a complete ring. Each section weighs 1-1.5 tons and is held in place by bolts weighing 10 pounds.

Did you know that during its first full year of operation in 1928, the Holland Tunnel handled 8,744,600 vehicles?

Did you know that the Holland Tunnel has four large ventilation buildings, two on each side of the Hudson River that house 84 huge fans, which change the air direction in both tunnels every 90 seconds?

Did you know that in 1930 the Holland Tunnel was considered by many as the eighth wonder of the world because it was the longest underwater tunnel in the world?

Did you know that the Holland Tunnel cost $48.5 million to build? Today the cost would be more than $1 billion.

Did you know there is only 13 feet, six inches between the roadway and the ceiling of the tunnel?

Did you know that the Holland is under the floor of the Hudson River? It is 72 feet from the surface of the river to the top of the tunnel.

Did you know that the outside diameter of the tunnels is 29 feet, six inches?

Did you know that construction of the Holland Tunnel took seven years?  Construction began Oct. 12, 1920 and was completed on Nov. 12, 1927.

Did you know that the methods used in the design and construction of the Holland Tunnel still form the basis for construction of underwater vehicular tunnels throughout the world?