From the main page of this site:
http://sphinxtemple.virtualave.net/index2.html
This link mentions South American tunnels:
http://sphinxtemple.virtualave.net/articles/tunnels1.html
Do any of these words ring a bell?
Sacsayhuaman
Paititi
Apucatinti
Samaipata
Sao Tome das Letras
One link mentions Apucatinti:
http://216.156.196.45/books/eng/paykikin/apucatinti.htm
There's a lot of truth kept hidden from us...