New York's Manhattan Bridge, 1909
This photo from March 23, 1909 shows New York's Manhattan bridge in its final year of construction, towering over the marine terminal in the foreground. The double-decked suspension bridge connects lower Manhattan with Brooklyn, carrying automobile, subway and pedestrian traffic. The bridge started construction in 1901 and has a total length of 6,855 ft (2,089m), reaching 135ft (41m) above the water. Four massive cables, each 21.25 inches (.54m) in diameter, stretch 3,224 ft (982m) across the top, providing support.
Fun Fact: The Manhattan Bridge was designed by Leon Moiseeiff, utilizing an (under)engineering principle known as Deflection Theory. This is the same Leon Moiseeiff who designed the Tacoma Narrows Bridge in Washington. Safe travels!