Urban Development Minister Shri M.Venkaiah Naidu today inaugurated the 4th 'Smart City Expo World Congress' at Barcelona, Spain. Shri Naidu was invited as the Chief Guest for the event by the Mayor of Barcelona, a city which is considered as the model smart city in the world. Shri Naidu is leading a 35-member Indian delegation to the Smart City Congress comprising of the Deputy Chief Minister of Punjab Shri Sukhbir Singh Badal, other elected representatives, senior officials from states, urban planners and experts and academicians.