The world's first real pizzeria was the Antica Pizzeria Port' Alba in Naples.
It opened in 1830 and is still serving pizzas today.
The true father of today's pizza was Rafaele Esposito of Naples who, in 1889, created the Pizza Margherita for King Umberto I and Queen Margherita of Italy.
The colours of the tomato, mozzarella cheese and basil in Pizza Margherita were designed to mimic the red, white and green of the Italian flag.
Pizza standards in Italy are maintained by the Associazione Verace Pizza Napoletana.
However, Europe's first pizza convention, Pizzatec, was held in January 1997 - not in Italy but Berlin.
The world's largest pizza was 122ft 8in in diameter, made in Norwood, South Africa, in 1990.
Inmates of the Dutra Ladeira Prison in Brazil run a pizza-delivery service both in and out of the jail.
The US Congress declared 4 June 1997 National Pizza Day to celebrate 100 years of American pizza.
About 100 acres of pizza are eaten every day in the US - that's about 350 slices a second.
Research in Britain shows that people with pierced noses, lips or eyebrows are 23% more likely to ask for vegetarian toppings than meat toppings on pizzas.
According to a survey in 2004, 6 per cent of people say pizza is the food they would most miss if they were stranded in an Australian jungle.
On 19 August 1998, US clothing manufacturers VF Corporation ordered 13,386 pizzas for their 40,160 employees. Guinness World Records ranks it as the largest single order for pizza.