"Walk with a noted historian as your personal audio guide on fields where decisive, dramatic battles took place. The battlefield podcasts are narrated by NPS historians and recorded on the battlefields. They feature introductions by John Fieseler or Marc Ramsey and the period music of Southern Horizon. They are complemented with detailed maps, so that you can easily follow the action.

You can subscribe (free) either Civil War Travelor.com or through iTunes.
Listen, download, and get the maps

The Cornfield, Antietam
 The bloodiest one-day battle of the Civil War began when thousands of Union soldiers plunged into D.R. Miller's cornfield. Tour the opening moments of the Battle of Antietam.
 
The Crater, Petersburg
Explore one of the most dramatic events of the Civil War - the explosion of tons of gunpowder under part of the Confederate line at Petersburg, July 30, 1864.

Pickett's Charge
Gettysburg, Pennsylvania
The doomed Confederate charge July 3, 1863, at Gettysburg has become one of the most famous events in American military history. Follow in the footsteps of Pickett's men that day.

Cold Harbor (June 1, 1864)
Hanover County, Virginia
The Union attack here June 1, 1864, nearly resulted in a critical breakthrough.
 
Five Forks Battlefield
Petersburg National Battlefield, Virginia
The Five Forks intersection was critical to the Confederate defense of Petersburg and ultimately Richmond in the spring of 1865. Learn about the decisive battle here on April 1.

Little Round Top
Gettysburg, Pennsylvania
Little Round Top on the Gettysburg battlefield was the scene of some of the most dramatic moments in American history, July 2, 1863.

Gaines' Mill
Hanover County, Virginia
Fighting here June 27, 1862, resulted in Robert E. Lee's first victory as commander of the Army of Northern Virginia and was a turning point in the Seven Days battles.

Malvern Hill
Henrico County, Virginia
A great walk of the Confederate attack route to the Union guns posted above them July 1, 1862.
 
Museum of the Confederacy
"The Confederate Years" exhibition
Richmond, Virginia
"The Confederate Years," the signature exhibit at the Museum of the Confederacy in Richmond, Va., covers the entire Civil War and some of the war's most famous artifacts including Robert E. Lee's camp gear and JEB Stuart's plumed hat."

Be aware of possible mature battle content as I have not had time to screen these thoroughly for younger ages.  They sound perfect for High School and College level studies.