Starting at Av. de la Paix 12, 1202 Genève, Switzerland, open the Explorial app and enter the 6-digit game code that you received by text and Viator chat message. You're steps from some of the world's most consequential addresses — the riddles make the connections. The first clue leads you to the Palais Wilson, named after President Woodrow Wilson and home to the United Nations Human Rights Office — a building that has witnessed a century of international diplomacy. From there the app guides you to Villa Rigot, a lakeside property that has housed everyone from diplomats to heads of state, set within gardens that feel removed from the city's urgent pace. Your final landmark is La chaise cassée, the famous broken chair sculpture outside the Palais des Nations — a three-legged monument to the campaign against landmines and a symbol of Geneva's unique role in the world. Around 2 hours at a comfortable walking pace. The game saves your progress if you stop to admire the lake.