When did I say that, or anything which you lead you to think that I believe such a thing?
Lots of things fit into that category, including most of the things in the history books. Inlcuding what happens inside of a given atom, which are unseeable.
The properties of the inside of an atom can be deduced from various scientific instruments. One need not use visible light. As for history, it depends on the history in question. If the consensus of historians is that the Roman Empire existed 2,000 years ago, that's perfectly plausible, wouldn't you agree? On the other hand, if Erich von Däniken says the aliens built the pyramids...not so much.
Or put it anothing way, anything that challenges your world view is to be dismissed—out of hand.
So I'm too close-minded, is that it? Ok...let's see just how open-minded you are! I'll give you a short list of 10 items (aren't pop quizzes fun?). Please tell me if you deny the existence of any of them. Not as in, "Oh, I suppose it might be true...there's no way to know, really", but as in "Oh, give me a break...how can any rational adult give credence to that?"
1) The Egyptian pyramids were built by aliens.
2) Witches can actually spells...that work.
3) Darth Vader and Luke Skywalker really existed in a galaxy far, far away.
4) The continent of Atlantis really existed.
5) Telekinesis is real.
6) Crystal healing works.
7) Geocentrism.
8) Perpetual motion can work.
9) Dowsing works.
10) Ghosts are real.
Surely you're not going to dismiss any of these out of hand?
On a side note, when these sorts of things come up I'm always reminded of a scene in Ghostbusters:
Janine Melnitz: Do you believe in UFOs, astral projections, mental telepathy, ESP, clairvoyance, spirit photography, telekinetic movement, full trance mediums, the Loch Ness monster and the theory of Atlantis?
Winston Zeddemore: Ah, if there's a steady paycheck in it, I'll believe anything you say.
Let;s stick to epistomology. how anyone knows anything. Probably there is no such thing as bilocation, just as probably there are no space aliens. But men are famous for entertaining ‘hypotheses,” which are part of our survival gear. And what is the source of all these speculation, these imaginings of alternatives to what we “know.:? What is the mind? A ghost in the machine, or a product of the workings of the machine, and how is is to that it does have the ability to extrapolate far beyond what we see, hear, taste and smell? What is the nature of mathematics?Is it part of the machine, ot is to a product of the mind? And how is it that it seems to corrolate with our common perception of the world? And what is this world beyond the things we bump into right now? And, of course, how is it that we are the only animals who think, who have this power of abstraction and detachment, so that even the savages have a “sense” of the immaterial?