St. Louis, MO: then and now

4 real landmarks in St. Louis, each with an old photo you can fade into today's view. Find four landmarks around St. Louis. At each one, check in to earn its badge, unlock its story, and collect a Time Card. Do them in any order. Everything stays on this phone.

• Gateway ArchA stainless-steel arch that took more than two years to build, and nobody has been able to out-tall it.
• Eads BridgeThe oldest bridge on the Mississippi, and the first to lean on steel.
• St. Louis Union StationA train station that was once the busiest in the world, and now is a hotel.
• Wainwright BuildingOne of the first skyscrapers that looked like a skyscraper.

Written from sources; not yet walked on site unless a stop says otherwise.