I was recently watching, Martin Sargeants,"unscrewed" on tech t.v., and he invited Dr.Bruce Goldberg. He is a retired dentist, and now practices hypnosis and specializes in progression and regression therapy. Well....in his new book he claims to have been to the 35th century, along w/ his patients, and they said in the year 3050 mankind will finally have the ability to time travel, and amusement park will be suspended in air....just some of the stuff he said on the show. He says our current infrastructure of the world, is brought to us by, time travelers...extraterrestrials, who have mastered time travel and are many years ahead of us, and that we have these TTravelers living w/ us right now...and disguise as normal ppl....
Heh, pretty whacko theory...but might be an intresting read...i only skimmed through his thoughts but his book provides evidence and what not..check it out here
http://drbrucegoldberg.com/TimeTravelersBook.htm