Atlantis: The Dig
One of the key exhibits in the Atlantis hotel is "The Dig", a fantasy journey through the "ruins" of Atlantis. The entry to The Dig is adjacent to the Hall of Waters, and the Dig's passages wind alongside the main fish pool. The Dig also has several of its own smaller aquaria (for some definition of small: each tank filled an entire wall, and was big enough to accomodate a diver).
The low lighting and almost-otherworldly artifacts reminded me a bit of my favorite game Myst.
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