Pittsburgh, PA: then and now

4 real landmarks in Pittsburgh, each with an old photo you can fade into today's view. Find four landmarks around Pittsburgh. 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.

• Monongahela InclineA tiny cable car that has hauled people up a cliff since 1870.
• Smithfield Street BridgeA bridge with lens-shaped steel arches that has carried traffic since 1883.
• Allegheny County CourthouseA stone castle of a courthouse that its architect called his greatest achievement.
• Fort Pitt Block HouseA small fort building from 1764, the oldest standing structure in western Pennsylvania.

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