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ST. LOUIS (KSDK) – The city's largest landmark turns 48 on Monday, and the iron workers, electricians, sheet-metal workers, draftsmen, field engineers, x-ray technicians and others who made it happen will be on-hand to celebrate.

On Oct. 28, 1965, workers put the final piece of the Gateway Arch into place, marking the completion of the tallest man-made monument in the U.S. The Arch stands at 630 feet, and in addition to being Missouri's tallest accessible building, is also the world's tallest arch.

The monument opened to the public on June 10, 1967.

In conjunction with the Arch's 48th anniversary, the National Park Service is holding a public meet-and-greet celebration with the monument's builders in the visitor center below the Arch.

"Without the hard work and dedication of our brave builders, the Arch wouldn't be what it is today," said Ann Honious, chief of museum services and interpretation at the Jefferson Expansion Memorial, in a news release. "This event is not just a celebration of the Arch's 48th birthday: it also honors those who made the Arch possible – the builders who ensured the Arch's entire construction process was successful, from laying its foundation to putting the final piece into place."

The builders will be available from 10 a.m. to 11:30 a.m. for autographs and photos with visitors. They'll also share firsthand stories of their roles in building the monument. The event is free and no RSVP is required.

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