Gateway Arch

St. Louis authorities are investigating why a small amphibious plane landed in the Mississippi River, setting off a brief panic.

If you want to take the tram ride to the top of the Gateway Arch, get there within the next month.

Here are the latest developments in St. Louis' celebration of the Gateway Arch turning 50:

Music, food, children's activities and fireworks will all be part of the 50th anniversary celebration of the Gateway Arch.

ST. LOUIS (AP) — The Gateway Arch in St. Louis is celebrating its 48th birthday today (Oct. 28).