At the risk of once again stirring up an old hornet's nest, you might want to do a search of all forums, all posts on the phrase "lost city".

But for starters you should probably read these threads:

http://www.gunks.com/ubbthreads/showflat.php?Cat=&Board=other&Number=35970&Forum=All_Forums&Words=lost%20city%20routes&Match=Entire%20Phrase&Searchpage=0&Limit=25&Old=allposts&Main=35970&Search=true#Post35970

http://www.gunks.com/ubbthreads/showflat.php?Cat=&Board=general&Number=87764&page=&view=&sb=5&o=&fpart=1&vc=1

http://www.gunks.com/ubbthreads/showflat.php?Cat=2,4,5&Board=routes&Number=84730&page=1&view=collapsed&sb=5&o=&fpart=1