The Gateway Arch is a metal structure in St. Louis, Missouri that stands 630 feet. A tram allows people to go to the top of it. Each year, about 4 million people visit the Gateway Arch. It cost about $13 million to make the arch and over $3 million to make the transportation system.
- "Gateway Arch Riverfront | Gateway Arch Facts". Gateway Arch Riverfront. Retrieved 2009-11-16.