Is Time travel really possible?

Some think that if time travel were possible you'd only be able to travel back in time to the point where time travel was invented...

They don't believe that in 100 or so years when or if it's invented that we'd be able see a time traveler now...

If it were possible then why haven't we seen one...is it because the future hasn't happened or could they be right?

For me this notion of time is a mental delusion we use to fathom the multidimensional nature of reality. We delude ourselves with the notion of chronology of time.

All reality exists in the 'present' thus past/future is at a higher dimensional level on consciousness is nonexistent.

Shakespeare once famously said: "to be or not to be." I have a better idea of what he meant by "to be". Once this year at a multi-week Catholic seminar on the Charisms of the Holy Spirit I experienced a moment were past/present/future collapsed into a moment of now/be. Elaborating on my experience: space itself didn't totally disappear into nothingness (whiteness of light). I could quite easy sense the material reality that was around me, what I did experience from a space perspective what that I was at its centre.

All up it was a pretty awesome experience, one I totally didn't expect from attending the seminar.

My understanding of the basic theories of time travel is that they are dependant upon multiverse theory, i.e. that there are many different 'dimensions' (realities, call them what you will) - one for each different choice made. Many of these are essentially similar. Some are not. When one travels 'backward' or 'forward' in )what we perceive as) time, one is really moving to another 'dimension' (reality, etc).

I do agree with Zelator's theory that time is a matter of perspective. I haven't had any instances of condensed time myself. I do believe the issue was raised on the Star Trek film 'Insurrection', and quite possibly on the film 'Deep Blue Sea'.

Ahh pop culture, is there anything you can't teach us?

According to dimensional theory, that is, the idea that only four dimensions exist. Then time travel is possible. We live in the third dimension and the in the fourth dimension, time is all at once. Therefore you could pop into the timeline anywhere from beginning to end.
So if that were the case, in the fourth dimension, the future has already happened. We are just riding along the continuum towards it.
The only way I can see traveling back and forth through time would be how Einstein proposed, through space travel. One would have to know the direction the earth is heading and where it has been.
I'm not speaking in just the solar system, I'm speaking of its real path, in the universe. Realistically the earth would be traveling in a sideways spiral, not just an orbit around the sun, but also the orbit of our sun around its black hole which probably orbits a quasar which orbits the nuclear center of the galaxy. Which our galaxy probably orbits a massive black hole in the center of the universe.
This task would be almost insurmountable to calculate.
The only other alternative would be to somehow get captured in the continuum stream. Thus freezing time and go sailing into the past.