The Gateway Arch is a 630-foot (192 m) (both high and wide) catenary arch built to commemorate the Lewis and Clark Expedition, initiated by Thomas Jefferson, and the subsequent westward expansion of the country. The nearby Old Courthouse, across a greenway to the west of the arch, was the first site of the Dred Scott case about slavery. A museum, located in the underground visitor center below the arch, describes the arch’s construction and the country’s westward expansion.
