Chicago has more than 550 parks, covering over 8,000 acres. elaborate
Addis Ababa is home to the African Union's headquarters. elaborate
Luxembourg City is home to the Bock Casemates, an extensive network of underground tunnels carved directly into the rock that once served as a defensive fortification and provided shelter for thousands of soldiers during world wars. elaborate
Vienna has more museums than any other city in the world. elaborate
Zurich has more museums per capita than any other city in Switzerland. elaborate
Geneva is home to the world's second-largest particle physics laboratory, CERN. elaborate
Montreal has an underground city, RÉSO, a network of tunnels connecting shops, metro stations, and office buildings. elaborate