Largest collection of Batman memorabilia
Who
Brad Ladner
Where
United States (Roswell)
When

The largest collection of Batman memorabilia belongs to Brad Ladner (USA) and consists of 8,226 different items, as verified in Roswell, Georgia, USA, on 11 April 2015.

Brad started collecting in 1988, when the 'Batman: A Death in the Family' hit the shelves.