Sydney got a taste of Gotham City this week when a person dressed as Batman was spotted standing atop the sails of the Sydney Opera House, part of a global promotional stunt from DC and Warner Bros. Discovery marking Batman Day. Early reports and local news initially speculated the sighting was tied to filming for a new movie, but the appearance was in fact a lead-up to the official celebration, with the real event unfolding at the landmark at 6 p.m. on Saturday, September 19. This year's festivities carried the theme Rule the Night and marked 87 years since the character's debut in Detective Comics, cementing Batman's status as one of the most enduring figures in comic book history.

The Sydney stunt was just one piece of a worldwide celebration spanning cities including New York, Los Angeles, Tokyo, Milan, Berlin, Mexico City, São Paulo, and Beijing, each hosting its own take on turning familiar skylines into Gotham City for a night. São Paulo projected the iconic Bat-Signal onto Avenida Paulista and hosted an open-air screening of Tim Burton's 1989 Batman, while Mexico City offered free outdoor movie nights and previewed a new comic, Batman of Two Worlds, alongside a trailer for Batman: Knightfall Part 2. Fans in numerous cities also turned out in costume for comic shop giveaways, themed runs, and classic film screenings, underscoring how Batman Day has grown from a modest annual tribute into a full-scale international celebration of the Dark Knight's legacy.