It's interesting to visit a familiar city on a semi-regular basis of about twice a year. It's a bit like slow time travel - changes can be large and noticeable, or small and subtle. In fact, this is probably the only feasible method of time travel, although it's not exactly what most people have in mind when they discuss the concept.
When you think about it, all you really need for successful time travel is a reliable method of suspended animation* and a great deal of faith in either automatic timing systems or your fellow man. Want to move to the year 3010? Climb in, close the lid, slowly drift off to sleep....when you wake up, presto, 1,000 years in the future.
As with most of the basic science fiction concepts, this one is first introduced by H. G. Wells. In his 1910 novel The Sleeper Awakes**, his character falls into a mysterious trance rather than being put on ice, but the results are the same. Most of the novel is the sort of thinly veiled socio-political criticism that too often dominates Wells' writing, but it does offer the interesting idea that after sufficient time, a person in suspended animation whose financial life continues to be active would eventually possess all the money in the world. (In the "A Fishful of Dollars" episode of Futurama, Philip J. Fry proves the benefits of compound interest by unintentionally leaving 93 cents in his bank account for 1,000 years at 2.25% and ending up with over four billion dollars.)
The idea was continued by Robert A. Heinlein in his 1956 work The Door Into Summer, which amplifies on the problems faced by Wells' protagonist in terms of adapting to a completely different society in the future. Obviously all of the scientific knowledge possessed by Heinlein's inventor/hero is obsolete, but the deeper problem is that all of his knowledge is obsolete, in every aspect of life.
They brought me modern clothes right after breakfast the next morning...and I had to have help in dressing. They were not so odd in themselves (although I had never worn cerise trousers with bell bottoms before) but I could not manage the fastenings without coaching. I suppose my grandfather might have had the same trouble with zippers if he had not been led into them gradually. It was the Sticktite closure seams, of course-I thought I was going to have to hire a little boy to help me go to the bathroom before I got it through my head that the pressure-sensitive adhesion was axially polarized. Then I almost lost my pants when I tried to ease the waistband. No one laughed at me.By the way, the hidden joke is that this particular Sleeper has ended up in the distant future of the year 2000.
When I mentioned that faith in one's fellow man was required for Sleeper time travel, it's not only in the area of having someone wake you up. Larry Niven's story The Defenseless Dead combines a growing need for transplant donors with a large pool of "corpsicles" - people in cryogenic suspension. The result? The Freezer Laws, which decree that anyone without sufficient funds to support them upon awakening is officially dead and as such can be used as a source of spare organs. In other words, you still wake up, but "one piece at a time", as one of the characters comments.
In my opinion, the best use of the idea of stasis time travel has to be Vernor Vinge's clever Marooned in Realtime, a murder mystery disguised as a science fiction novel, or vice versa. Vinge's novel is based on the idea of bubbles of suspended time - "bobbles", in the parlance of the novel. Bobbles are indestructible and with sufficient power can be created to be of almost any size or duration.
The novel takes place after the Singularity, a point in human development where humanity has made a quantum leap to another state of evolution, leaving behind a silent, empty planet. However, people who are in bobbles suffer the fate of the lame boy in the Pied Piper legend, left behind when the doors to paradise close. The more technologically advanced survivors decide to use their bobbling technology to travel through however many millenia are necessary to collect all of the remaining humans as they emerge from their bobbles, in hopes of rebooting humanity as a species.
Problems arise when one of the originators of this plan is murdered. The weapon? Old age - they're trapped outside the bobbles and left to die while everyone else travels a thousand years. Needless to say, the clues are not in the best of condition after the crime is discovered.
Of course, interesting though all of these ideas are, there's one problem with this particular approach to time travel. After all, once I've finished my little faux time travel visits to Toronto, I can go home again...
- Sid
** Originally published in 1899 under the title When the Sleeper Wakes, but Wells did some rewriting and re-published it - which may mean that Wells also originated the concept of the director's cut.