Largest collection of X-Men memorabilia
Who
Eric Jaskolka
Where
United States (West Des Moines,,In his basement.)
When

The largest collection of X-men memorabilia is 15,400 items and belongs to Eric Jaskolka (USA), in West Des Moines, Iowa, USA, as of 28 June 2012. The collection began in 1989, initially consisting of just comic books before later expanding to cover other items relating to the X-men franchise.