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The Missouri Corn Palace in the Palace of Agriculture, west of present-day Skinker and Wydown boulevards. (Missouri History Museum)

Looking West from a Lagoon toward East End of the Palace of Machinery. 1904 World's Fair. Oil painting by John Ross Key, 1904. Missouri History Museum

Sacramento Valley Exhibit in the California section of the Palace of Agriculture at the 1904 World's Fair. Mr. Filcher, Mr. Wiggins, and Governor Pardee of California pictured.

Demonstration of finger printing system at the Police Department Exhibit in the Palace of Education at the 1904 World's Fair. ©Missouri History Museum

Festival Hall was the centerpiece of the Fair, standing atop Art Hill in front of the Palace of Art. Two hundred feet high, its gold leaf dome was larger than the dome of St. Peter's Basilica in Rome. It housed the largest pipe organ in the world and could seat 3,500 people in its huge auditorium for concerts.

The great Floral Clock, 112 feet in diameter, was a popular exhibit on a hillside near the Palace of Agriculture. The thousands of flowering plants on the clock’s face were 'timed' to bloom throughout the passing of the day's hours. The tip of the 74-foot long minute hand moved 6 feet every minute. The 1904 World's Fair Society owns the clock's master works, which is presently on display at the History Museum in Forest Park.

Workers hoisting the first piece of staff onto the Palace of Varied Industries during the construction phase for the 1904 World's Fair, 10 June 1902. Missouri History Museum