Largest number of people posing naked for photograph: 7,000 in Barcelona, Spain. The photographer was Spencer Tunick, June 2003.

Biggest nude skydiving formation: 23 performed in 1988 over Batchelor, Australia.

Most naked people on rollercoaster: 28. Thorpe Park, England, May 2004. The oldest participant was 47.

First naked crossing of the European Alps: Richard Foley, UK completed the task in July 2005. His journey took him from Garmisch-Pattenkirchen in Germany through to Vipiteno in Italy.