Space.
I know I'll never live to see it, but interstellar travel is one of the most fascinating concepts to me. The thought of other intelligent life eons beyond our comprehension is just too much to not explore. We're not even in our infancy technologically speaking. Hell we're not even a fuckin' zygote. I'd love to know if any other species in some other solar system ever got advanced enough to contact another. Cosmic statistics would have to dictate that they have. That's just so much more fascinating to me than a sea turtle.
