I really want to see a Rattler in the wild (not exactly up close, obviously)
in my teenage years we would occasionally see small Timber Rattlesnakes, but those were pretty rare.
now I live right in prime Western Diamondback range.
we're also right around the edge of the ranges of a few other species:
Mojave
Prairie
Blacktail
Banded Rock
I'm not exactly wanting to go looking for them though since I'm not readily familiar with what to look for if it doesn't give me a warning rattle.
back home we have a ridiculous abundance of Water Moccasins (cottonmouth) and Copperheads.
I grew up in the woods and marshes so I knew what to look, listen, and even smell for.
So it was extremely rare for me to "sneak up" on one accidentally. I usually knew before I saw it that it was there. Or at least in the case of copperheads, I knew I was in a perfect territory and really looked for them.