The Video Mapping Blog references various examples of video projection mapping, done at any scale.
Obscura Digital showed this beautiful architecture mapping on the Sheikh Zayed Grand Mosque during the UAE National Day (December 2nd) this year.
In celebration of UAE National Day 2011
Projection and design by Obscura Digital
44 projectors with a combined brightness of 840,000 lumens were used to cover a surface 600ft wide x 351ft high