If you want to check a a great author who's been searching for an ancient "lost civilization", check this site out.

Graham Hancock

I think his evidence for some ancient, world spanning civilization is a little thin. Is he a professional archaeologist or historian?

I believe he's a little of both and a freelancer.

Here's a website of an organization (or somebody) who visits and photographs locales of ancient civilizations:

www.onealclan.com

or webpage at http://onealclan0.tripod.com/end_times.htm

Also, if you're into Coral Castle, check out http://onealclan0.tripod.com/coral_castle

the truth is not in his opinion but in the archaeology itself