Largest 3D screen

According to Official Guinness Records,

The largest stereoscopic 3-D film screen measured 29.78 m x 12.33 m (98 ft x 40 ft) and was unveiled at the French première of Harry Potter and the Deathly Hallows – Part 2 at the Palais Omnisports de Paris-Bercy, in Paris, France, on 12 July 2011.
They also attempted the record for The largest audience at a 3-D film screening

For a complete list of 2011 records, please visit 2011 Guinness Records in France.

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Other France records that might interest you:

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• Most people crammed in a Fiat 500
• Fastest walk 50,000 metres (male)
• Farthest triple jump (male) (indoors)
• Most individual juggling rotations in one minute (5 clubs)