Unexploded ordnance (UXO)
Depends on which side you're on...Photos showing wounded and dead civilians
Statue made from pieces of shrapnel
On the grounds of the War Remnants Museum is a replica of a French Prison, complete with cells, high stone walls, bars, and the guillotine.
A captured UH-1 Huey gunship with 101st Airborne Division markings
I'm pretty sure that's not standard U.S. Army issue...
Interestingly, though, you could get Zippo-type lighters with various insignia welded to them, dog-tags, and other "authentic" items.
The Vietnam Memorial is a tribute to the American Soldiers who lost their lives in the Vietnam War. This sunken black granite monument was not well recieved when it was originally proposed as many people felt that it would be a dark hole in the capitol mall and would not honor the dead.
Wildman's Civil War Surplus is run by self-styled racist Dent "Wildman" Myers, who was born in 1930. Meyers calls his store "The Best Little War House in Kennesaw." He sells Civil War relics, political books, medicinal herbs, posters praising defenders of the white race, Stars and Bars flags, and White Power CDs.
The wreckage of a U.S. aircraft, downed during the Vietnam War, rests today in Hanoi's Army Museum