Keep scrolling down for answers and more stats ...
1.These are all country capital cities:
La Paz
✓
Monrovia
✓
Sydney
✓
Tokyo
✓
Vaduz
✓
Sydney is the largest city in Australia, but Canberra is the capital.
2.These are cities located in Africa:
Addis Ababa
✓
Alexandria
✓
Ankara
✓
Antananarivo
✓
Oran
✓
Ankara is the capital of Turkey, thus it's not in Africa (it's in Asia).
3.These are all located on an island:
Copenhagen
✓
Havana
✓
Manama
✓
Taipei
✓
Vancouver
✓
Copenhagen is on Sjæland, Havana is on Cuba, Manama is on Bahrain and Taipei is on Taiwan. Vancouver island is in front of Vancouver, so the city is not on the island.
4.There's a river that flows through all of these:
Cairo
✓
Moscow
✓
Nantes
✓
Paris
✓
San Francisco
✓
The rivers are the Nile (Cairo), the Moskva (Moscow), the Loire (Nantes) and the Seine (Paris).
5.These have all been host cities of the Summer Olympic Games
Antwerp
✓
Milan
✓
Montreal
✓
Moscow
✓
Saint Louis
✓
Milan will co-host the 2026 Winter Olympic Games with Cortina d'Ampezzo, but it has never hosted the Summer Games.
6.These are all cities where the trans-Siberian railway has a stop:
Kazan
✓
Moscow
✓
Novosibirsk
✓
Perm
✓
Yekaterinburg
✓
7.These are all along the Danube river:
Belgrade
✓
Bratislava
✓
Budapest
✓
Bucharest
✓
Vienna
✓
The Danube flows through 4 European capitals, and even though it's delta is in Romania, Bucharest is not one of them.
8.These are the '4 great ancient capitals of China':
Beijing
✓
Luoyang
✓
Nanjing
✓
Shanghai
✓
Xi'an
✓
9.These are cities that exist in the UK and Canada:
Cambridge
✓
Glasgow
✓
London
✓
Windsor
✓
Truro
✓
Glasgow, UK and New Glasgow, Canada both exist, but there's no Glasgow, Canada.
10.These are all cities mentioned in the Bible:
Alexandria
✓
Corinth
✓
Jerusalem
✓
Nazareth
✓
Sodom
✓
11.These are all cities named after a king/queen:
Charleroi
✓
Saint Louis
✓
Kristiansand
✓
Saint Petersburg
✓
Victoria
✓
Saint Petersburg was named by Peter the Great after Saint Peter.
12.These are all cities named after a US president:
Hamilton
✓
Jacksonville
✓
Jefferson City
✓
Monrovia
✓
Lincoln
✓
Hamilton is a city in Canada named after George Hamilton, a Canadian merchant and politian.
13.These are all transcontinental cities:
Istanbul
✓
Orenburg
✓
Panama
✓
Suez
✓
Yekaterinburg
✓
Panama is a transcontinental country, but it is the Darien gap where the line between North and South America is, for those that consider both two continents (not in Panama City itself).
14.These are all cities that have the same spelling on it's native language:
Frankfurt
✓
Madrid
✓
Porto
✓
Rotterdam
✓
Turin
✓
Turin is called Torino in Italian.
15.These cities have more than 1 million inhabitants:
I think question 14 is the wrong way round: If Turin is the answer, then question would be: "these are all cities that are spelled the same in their native language as in English".
Thanks for noticing!