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Summer Hours
Extended Summer Hours for Jefferson National Expansion Memorial starting Memorial Day weekend, Saturday, May 25, 2013, through Labor Day, September 2, 2013, the Gateway Arch hours are 8:00 a.m. to 10:00 p.m. More »
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Did You Know?
On September 10, 1804 on Cedar Island, in South Dakota, William Clark discovered the fossilized remains of the ribs, backbone and teeth of a plesiosaur. Plesiosaurs were animals who lived at the same time as the dinosaurs, but swam rather than walking on land. Clark thought it was a giant fish bone! More...