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Checkpoint: Royal Castle
Navigate to the Royal Castle (Zamek Królewski) and check in.
Checkpoint: Royal Mile
Navigate to the Royal Mile (the High Street running between the castle and Holyrood Palace). Check in along it.
Checkpoint: Royal Palace
Navigate to the Royal Palace (Slottet) at the top of Karl Johans gate and check in.
Checkpoint: Rozenhoedkaai
Navigate to the Rozenhoedkaai (Rosary Quay), the most photographed corner in Bruges, and check in at the canal-side fence.
Checkpoint: Ryman Auditorium
Navigate to the Ryman Auditorium, the Mother Church of Country Music. Check in once you are at the entrance.
Checkpoint: Sacré-Cœur
Climb (or take the funicular) up to Sacré-Cœur in Montmartre and check in once you can see the white domes.
Checkpoint: Sagrada Familia
The world's most famous unfinished cathedral. Navigate to Sagrada Familia and check in once you can see Gaudí's towers above you.
Checkpoint: San Miguel Mission
Walk south across the Santa Fe River to San Miguel Mission on Old Santa Fe Trail and check in at the entrance.
Checkpoint: Santa Fe Plaza
Navigate to the Santa Fe Plaza in the historic centre and check in by the obelisk in the middle.
Checkpoint: Santa Maria delle Grazie
Navigate to the church of Santa Maria delle Grazie (where the Last Supper lives) and check in at the front.
Checkpoint: Santa Monica Pier
Navigate to the famous Santa Monica Pier. Check in once you spot the Ferris wheel above the ocean.
Checkpoint: Schönbrunn
Navigate to Schönbrunn Palace and check in (the Gloriette hilltop is a great alternative spot).
Checkpoint: Sé Cathedral
Navigate to the Sé do Porto cathedral at the top of the old town and check in at the entrance square.
Checkpoint: Senate Square
Navigate to Senate Square (Senaatintori) in front of the white Helsinki Cathedral. Check in.
Checkpoint: Sforza Castle
Navigate to the Castello Sforzesco and check in at the front gate (the round Filarete tower).
Checkpoint: Shockoe Slip
Walk east and downhill to Shockoe Slip and check in on the cobblestones around the old tobacco warehouses.
Checkpoint: Skansen
Navigate to Skansen open-air museum (or its entrance) on Djurgården and check in.
Checkpoint: Sky Tower
Navigate to the Sky Tower on Federal Street in the Auckland CBD and check in at the base.
Checkpoint: Skyline Gondola
Walk one block north up Brecon Street to the Skyline Gondola base station and check in at the ticket office.
Checkpoint: Smithfield Street Bridge
Walk to the Smithfield Street Bridge, the historic yellow lenticular-truss bridge over the Monongahela, and check in at the downtown end.
Checkpoint: South Beach
Navigate to Lummus Park along Ocean Drive on South Beach. Check in once the team can see a colourful lifeguard tower.
Checkpoint: South Congress
Navigate to South Congress Avenue (SoCo), the trendy strip just south of the river. Check in once you are surrounded by boutiques, food trucks and murals.
Checkpoint: South Slope
Walk south on Coxe or Lexington avenues into the South Slope brewery district and check in by any brewery taproom.
Checkpoint: Space Needle
Navigate to the foot of the Space Needle. Check in when the famous spire is rising above the team.