Original Underwater HotelFlorida, USA
Underwater hotels in the 1980s weren't really a thing.
When we say they weren't really a thing, we mean they didn't exist at all. Until Jules' Undersea Lodge came along.
YouTuber Ryan Trahan recently spent a night in the Lodge, which was the world's first underwater hotel when it came arrived in (beneath) Florida in 1985. Before that it was a laboratory.
And while the upscale versions in Dubai and such now are luxurious affairs, this one is anything but. You even have to scuba dive to get there.
Check out how Trahan fared: