60 world leaders are attending the two-day event, including US president Barack Obama
28 representatives for each of the 28 Nato member countries are present
9,500 police officers from forces across England and Wales are on duty as part of a major security operation
12 miles of 9ft high security fencing, the so-called "ring of steel", has been placed around Celtic Manor in Newport, Wales where the event is taking place – 24 years since the UK last hosted a Nato Summit back in 1990
Three weeks taken to erect the fence
10,000ft no-fly zone over parts of South Wales and Bristol
£6m – reported worth of events contract for the NATO Summit, which was awarded to UK events agency M following a tender process
800 Celtic Manor staff working on the event
10,000 support staff have been involved in the event
1,500 media are reporting on the event
15,000 meals served to delegates and the media over two days
24,000 rooms booked in 80 hotels in Newport, Cardiff and Bristol over two nights
20,000 protesters expected
Celtic Manor chief operating officer Ian Edwards said: "We're delighted to have been given this opportunity to host such an important summit and to welcome so many of the world's most influential leaders to the Celtic Manor Resort.
"To give you an idea of the scale of the operation, our head of event management, Leon Hughes, would normally look after around 20 big conferences and events during a year. This year he has been taken off all other events to concentrate solely on the NATO Summit because of the level of detail required."