Keep scrolling down for answers and more stats ...
1. Which image shows Paris?
Eiffel Tower, Paris, from Trocadero (Others: Blackpool, Vienna, Warsaw)
2. Which image shows Kiev?
St. Michael's Golden-Domed Monastery in Kiev (Others: Moscow, Minsk, Riga)
3. Which image shows Reykjavik?
View from Halgrimskirjka, Reykjavik (Others: Tromsø, Helsinki, Copenhagen)
4. Which image shows London?
Tower Bridge over the River Thames in London (Others: Bruges, Budapest, Berlin)
5. Which image shows Athens?
The Parthenon on the Acropolis in Athens (Others: Évora, Paestum, Agrigento)
6. Which image shows Frankfurt?
Frankfurt city skyline (Others: Madrid, London, Amsterdam)
7. Which image shows Belgrade?
Kalemegdan Park in Belgrade (Others: Brussels, Zurich, Stockholm)
8. Which image shows Rome?
The Colosseum in central Rome (Others: Arles, Pula, Nimes)
9. Which image shows Barcelona?
Sagrada Família in Barcelona (Others: Beauvais, Milan, Exeter)
10. Which image shows Moscow?
The Kremlin in Moscow (Others: Versailles, Amsterdam, Naples)
11. Which image shows Oslo?
Astrup Fearnley Museum of Modern Art in Oslo (Others: Bilbao, Paris, Graz)
12. Which image shows Warsaw?
The National Stadium in Warsaw (Others: Barcelona, Munich, Vienna)
13. Which image shows Dublin?
The Temple Bar pub in Dublin (Others: Stockholm, Madrid, Brussels)
14. Which image shows Prague?
Charles Bridge over the Vitava in Prague (Others: Amsterdam, Avignon, Mostar)
15. Which image shows Berlin?
Brandenburg Gate, Berlin (Others: Paris, London, Bucharest)
16. Which image shows Tallinn?
Tallinn old town wall (Others: Dubrovnik, Carcassonne, Avila)