Introduction: Dangerous neighbors: volcanoes near cities -- Too many people and too many volcanoes - Naples, Italy -- A full menu of volcanic hazards - Mexico City -- "Like dangerous, yet undeniably beautiful women" - Guagua Pichincha, and Cotopaxi volcanoes near Quito, Ecuador -- Dangerous neighbors, but some bring gifts - Manila Megacity, Philippines -- "It's part of the culture. Live with it!" - cities in Japan -- Volcanic and proud of it - Auckland, New Zealand -- Coffee, software, aircraft, and volcanic mudflows - Seattle, Tacoma, and Portland, USA -- A tale of two cities - Akrotiri (Island of Santorini, Greece) and Plymouth (island of Montserrat, Caribbean) -- The dangerous neighbor is restless - how should a city respond?