This section contains all questions that could appear in this quiz. The quiz will select 15 random questions from this pool. For example, if a question asks which city has streets that play music when driven on at the correct speed, only the correct answer of Gyeonggi-do appears below. We hope you enjoy discovering these fascinating urban curiosities!
Q1: What was the first city in history to reach a population of one million inhabitants?
A1: Rome
Q2: Which city built the world's first underground railway system?
A2: London
Q3: Which ancient city was home to the Hanging Gardens?
A3: Babylon
Q4: Which city was the first to implement a congestion charge?
A4: Singapore
Q5: Which city is home to the world's first vertical forest buildings?
A5: Milan
Q6: Which city built the world's first public park in the 19th century?
A6: Birkenhead
Q7: Which city implemented the first large-scale bicycle sharing system?
A7: Copenhagen
Q8: Which city has the highest percentage of green roof coverage?
A8: Stuttgart
Q9: Which city has the largest network of automated driverless metros?
A9: Dubai
Q10: Which city has the most extensive low-emission zone?
A10: Madrid
Q11: Which city has the highest number of electric vehicle charging points per capita?
A11: Amsterdam
Q12: Which city has the highest percentage of waste recycling?
A12: San Francisco
Q13: Which city has the most extensive network of urban gardens and community farms?
A13: Havana
Q14: Which city has the highest density of smart sensors for monitoring urban environment?
A14: Singapore
Q15: Which city is built on the most islands?
A15: Stockholm
Q16: Which major city is built on a delta where three rivers meet?
A16: Pittsburgh
Q17: Which city sits at the highest elevation above sea level?
A17: La Paz
Q18: Which city sits on the world's deepest natural harbour?
A18: Sydney
Q19: Which city is located at the meeting point of two continents?
A19: Istanbul
Q20: Which major city is built around the world's largest urban forest?
A20: Rio de Janeiro
Q21: Which city is built entirely within a volcanic crater?
A21: Rabaul
Q22: Which city has roads that play music when driven on at the correct speed?
A22: Gyeonggi-do
Q23: Which city has an entire parallel city built underground?
A23: Coober Pedy
Q24: Which city's traffic is managed by trained monkeys?
A24: Lopburi
Q25: Which city has streets heated from below to prevent snow and ice?
A25: Reykjavik
Q26: Which city has buildings that are legally required to be painted in one of 8 specific shades of pink?
A26: Jaipur