Does it seem to you that B+R run across an awful lot of ancient ruins on their adventures? Also, does it seem to you that they're awfully... well, CASUAL about it? I mean, look at that field of giant statues they're running through. That's some pretty cool stuff right there - I bet a lot of archaeologists would be mighty interested. And yet, no one (except for the narrator) even mentions them! I mean, I know that they're kinda focused on what they're doing, but you'd think that afterwards, we'd at least get a nod towards how they're, y'know, standing in the middle of a field of giant stone idols:
"Well, that wraps that up. Remind me to inspect those sulphur deposits I... hey... whoa! Robin, did you notice these?"
"Wow! A field of giant stone idols! Holy cow!"
"Indeed. They must date back at least a thousand years! And look at those faces - they're African faces, yet the Asian clothes and the crossed-leg poses seem to suggest a Buddhist connection! A record of a lost chapter in the history of Buddhism! What a find!"
"Golly! Well, we may have lost the Navy's ship, but I bet the professors at the Gotham Museum will be interested in this!"
"You said it, old chum! Now let's go back to catching crooks, shall we?"