People crowd Mulberry Street in New York City in 1900.
The streets were filled with vendors.
A Union soldier guards a slave auction house in Atlanta, Georgia, in 1864.
The photo was taken by George N. Barnard, official army photographer for General William Tecumseh Sherman during the American Civil War.
Gutzon Borglum and a superintendent inspect work on Mount Rushmore in 1932.
The sculptures were originally supposed to go from head to waist.
Wilbur Wright glides down the steep slope of Big Kill Devil Hill in Kitty Hawk, North Carolina, in 1902.
The Wright Brothers would complete their first powered flight in December 1903.
Officials ride in one of the penstock pipes of the soon-to-be-completed Hoover Dam in 1935.
The Hoover Dam was completed in 1936.
The Golden Gate Bridge is still under construction in 1934.
Construction ended in 1937.
The Eiffel Tower is in the middle of being built in 1888.
Construction was completed in 1889.
Workers are busy putting together the Statue of Liberty inside French sculptor Frédéric Auguste Bartholdi's workshop in Paris in 1882.
The copper statue was dedicated in 1886.
In 1881, the Tower Bridge in London doesn't connect quite yet.
It was completed in 1894.
In 1942, during World War II, the Taj Mahal is partly covered in bamboo scaffolding to disguise it from enemy bombers.
In front of it, Private First Class John C. Byrom, Jr., of Waco, Texas, is trying to catch a goldfish in the marble-lined pool. Corporal Anthony J. Scopelliti and Private First Class Ray Cherry are watching him try.
A Douglas SBD 'Dauntless' dive bomber balances on its nose after crash-landing on a carrier flight deck in 1943.
The Scout Bomber Douglas was first used at Pearl Harbor.
This photo shows the interior of a salvaged U-Boat after being sunk in the North Sea in 1918.
The term U-Boat derives from unterseeboote, German submarines.
A "Laplander" is photographed by Augustus Francis Sherman, the chief registry clerk at Ellis Island, in the 1900s.
His photos were published in National Geographic in 1907.
Photographer Arnold Genthe captures Chinese immigrants on the "Street of Gamblers" in San Francisco.
Many photographs of Chinatown were destroyed after earthquakes and fires hit in 1906.