On Saturday, September 21st (a.k.a. Batman Day), the old Domino Sugar Refinery building on the Williamsburg waterfront got bathed in the Bat-Signal for four hours. The iconic image lit up the side of the building from 8 p.m. until midnight, helping to mark the 80th anniversary of Batman making his debut appearance for DC Comics. The signal also made appearances in other cities like Berlin, Paris, and Tokyo.

The signal brought out a lot of fans of the Caped Crusader, and even Batman himself...

Here's a look at what Batman Day looked like around the world, including all of the Bat-Signals.

Here in Gotham, the Empire State building's spire was also lit up in Batman yellow, and NYPD Police Commissioner James O'Neill even changed his Twitter name to Commissioner Gordon for the night, NY1 reports.