QR codes. Look into the Museum of Danish Resistance, they have implemented a really impressive guide app (on a device they hand you when you walk in), which you use to scan QR codes and listen to audio narration as you walk through the museum. Much more interactive than a standard audio guide, and really changed my perspective of what a museum can be. I think the Alcatraz museum does something similar, but I haven't been in a long time so my memory is fuzzy.
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