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Seattle Underground
(en.wikipedia.org)
Like Old New York beneath New New York by the 31st century!
I always remember the toilet on a huge raised platform from this tour. Made me laugh so hard.
The underground tours are great. You get different anecdotes from different companies and different guides. I'd recommend them to anyone visiting Seattle, especially the after dark (adults only) tours.
I didn't have time when I was up there last, but it's on the list.
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