The term 'CAPITALE EUROPEA' can be solved by the four-letter word 'ROMA'. Rome is the capital of Italy and is one of the oldest cities in Europe, having been founded in 753 BC. It is also one of the most populous cities in Europe, with a population of over 2.8 million people. Rome is home to many iconic landmarks, such as the Colosseum, the Pantheon, and the Trevi Fountain. It is also home to the Vatican City, the smallest sovereign state in the world.