What I want to discuss here is pseudo-archeology and how much of it stands up to the scrutiny of reason and actual archaeological evidence. There are tons of meta-physical and pseudo-archaeological theories about everything remotely mysterious like Stonehenge, the Great Pyramids and the temple complex at Baalbek to name a few. Of course this practice of coming up with strange theories to explain mysterious archaeological findings doesn't just apply to megalithic structures. It extends to archaeanthropology and even geology.
I'll start off by giving an example. The temple complex of Baalbek is located in Jordan and contains the largest known obelisks from antiquity. Some of the pieces are so large that no one is 100% sure how much they really weigh. Estimates range from 1000 to 1500 TONS.
Notice the person on the left, and compare his size with the obelisks in the middle layer of the structure.
Here is another photo of a piece which was never fully cut out of the quarry. Again, notice the size of the people. Keep in mind that these photos are not shopped and that the site is a famous tourist attraction, meaning it isn't a hoax.
The most prevalent pseudo-archeology theory about Baalbek will have you think that a structure of this monstrous size could not have been constructed by mere humans, thus implicating ancient technologies, advanced unknown civilizations, giants or even aliens. They also dispute that the site is of Roman origin, claiming that it has existed since the time of the Canaanites, and that the Romans simply built upon it as the Arabs did even later down the road.
The site was excavated and analyzed by an archaeological team in the early 1900's, and they found no evidence to indicate what the crackpots are saying. The structure was found to be of typical roman honeycomb masonry down to its foundation. The quarry site also happens to be higher up in elevation than the temple, meaning the obelisks were never lifted into place, but simply dragged and rotated. Instead of writing about how this could have been accomplished, I'll provide an awesome linky to a video:
http://www.youtube.com/watch?v=lRRDzFROMx0
As the video shows, one person alone can accomplish what seems impossible with a bit of ingenuity and no modern technology or materials. Having inexhaustible manpower, brilliant architects and clever engineers at their disposal, it isn't so hard to imagine the Romans constructing the temple at Baalbek.
Obviously I haven't presented all of the evidence which supports or disclaims both the mainstream theory and the pseudo-archeology theory or theories, however I think I summarized it well. If you want the details, Google is your friend.
This is an example which has been refuted already and yet it still persists, lurking in the corners of the web for those who aren't satisfied with the truth.
Other topics we can discuss are the existence of a race of giants in the not-so distant past, Ooparts (out of place artifacts), and anything in relation to this you are intrigued by.
By the way, I'm a long time lurker, but just recently registered.