"Cu Chi-tunnels" a Cu Chi Travel Page by kimmo_v

Cu Chi was a major irritation to U.S. forces during the war.
More than 150 miles of tunnels were constructed over a 10 year period on three levels (some up to 23 feet deep), creating an underground complex for 16,000 guerilla fighters just 22 miles outside Saigon. It was originally constructed for the war against the French, then later used against the United States. Initially the U.S. military sent in troops, but quickly realized it was a death trap to any American going in. Later the U.S. tried to bomb it out of existence, but these actions were quickly discovered to be futile against the well constructed tunnels. There are bomb craters all over up above which stand testament to the B-52s vain attempts.

We were highly impressed after visiting that complex, and will recommend it as a absolute must see in Viet Nam.