The Primeval World diorama is part of the rather large Old Admin building, so that’s also worth keeping in mind. Here’s Tokyo’s primeval world diorama:
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Personally, I’ll pass. I’m a California local so I love the dioramas, but my favorite part of the Walt Disney World Railroad AND the approach to the Magic Kingdom is the vista on the railroad tracks, on that peaceful grassy embankment in between Tomorrowland and Seven Seas Lagoon. That is one MK-specific feature that gives me the warm fuzzies.