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Checkpoint: Old Courthouse
Walk west one block to the Old Courthouse on the Gateway Arch grounds and check in at the front steps.
Checkpoint: Old Harbor
Navigate to the Old Harbor and check in among the fishing boats.
Checkpoint: Old Mill District
Walk or ride south along the river to the Old Mill District and check in among the converted mill buildings.
Checkpoint: Old Mission Santa Barbara
Travel to the Old Mission Santa Barbara on the hill north of downtown and check in on the plaza in front.
Checkpoint: Old Town Scottsdale
Navigate to Old Town Scottsdale and check in around the Civic Center fountain on Main Street and Brown Avenue.
Checkpoint: Old Town Square
Navigate to the Old Town Square (Rynek Starego Miasta) and check in.
Checkpoint: Old Trafford
Hop a tram on the Metrolink (Altrincham line) to Old Trafford and check in at the Sir Matt Busby statue outside the stadium.
Checkpoint: Olympiapark
Navigate to the Olympiapark and check in.
Checkpoint: Opera House
Navigate to the Oslo Opera House on the waterfront and check in.
Checkpoint: Pack Square
Navigate to Pack Square in downtown Asheville (between Broadway, Patton and Biltmore avenues) and check in.
Checkpoint: Painted Ladies
Navigate to Alamo Square Park, where the famous Painted Ladies row of Victorian houses lines the hilltop. Check in once you can see them.
Checkpoint: Palace of Culture
Navigate to the Palace of Culture and Science (Pałac Kultury i Nauki) and check in at its base.
Checkpoint: Palace of the Governors
Walk to the north side of the Plaza and check in on the long Palace of the Governors portal.
Checkpoint: Pantheon
Navigate to the Pantheon at Piazza della Rotonda and check in.
Checkpoint: Park Güell
Navigate to Park Güell, Gaudí's mosaic playground on the hill, and check in.
Checkpoint: Parliament
Navigate to the Hungarian Parliament Building on the Pest side of the Danube and check in.
Checkpoint: Peabody Hotel
Walk west to the Peabody Hotel lobby and check in by the marble fountain (time it for 11 a.m. or 5 p.m. for the duck march).
Checkpoint: Pearl District
Walk or rideshare north along the Museum Reach of the river to the Pearl District (former Pearl Brewery), and check in by the Bottling Department food hall.
Checkpoint: Pearl Street Mall
Navigate to the Pearl Street Mall in downtown Boulder and check in along the pedestrian bricks.
Checkpoint: Piazza della Signoria
Navigate to Piazza della Signoria, the political heart of Florence, and check in.
Checkpoint: Piazza San Marco
Navigate to St. Mark's Square (Piazza San Marco) and check in.
Checkpoint: Pike Place Market
Navigate to the giant red Public Market sign at Pike Place Market. Check in once the team is right under it.
Checkpoint: Pioneer Courthouse Square
Navigate to Pioneer Courthouse Square in downtown and check in on the brick steps.
Checkpoint: Place Jacques-Cartier
Navigate to Place Jacques-Cartier in Old Montreal and check in on the cobblestoned square.