The tournament is guaranteed at least £600million from TV rights and sponsorship, and UEFA have set up a special company to organise the finals for the first time.
But it is far from easy organising a major sporting event in these troubled times.
Portugal will have naval vessels patrolling harbours and its hundreds of miles of coastline.
Air force F-16 fighters will be on permanent alert and Nato is lending an Airborne Warning and Control System surveillance plane to guard the country's air space.
Police marksmen will be stationed on rooftops overlooking the grounds. Leave has been cancelled for the 60,000 police, firefighters, emergency medical workers and coastguards deployed during the three-week event.
Fans will have to pass through metal detectors at all the grounds. Officials revealed today that the machines would also be deployed at open-air festivals for fans in city centres.
Portugal has given 12,000 police officers special training in crowd control and spent £10m on new vehicles, body armour, gas masks and other equipment.
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