West Confederate Avenue runs roughly along the Confederate battle line at the start of the third day, and marks the launching point for the ill-fated final assault known as Pickett's Charge. The Confederate monuments generally were built more recently than the Union monuments in other areas on the battlefield, primarily because people didn't see a need to commemorate Confederate achievements when monuments started going up in the 1880s. Plus the states of the former Confederacy generally didn't have the money to build monuments to a battle in Pennsylvania.
Today's Confederate Avenue runs one way (heading south, of course) from the Lutheran Theological Seminary near the West Middle Street intersection. The roadway continues past the popular Virginia monument (topped by Robert E. Lee and Traveler), past Pitzer Woods (the site of an observation tower that'll give you a better workout than the stair-climbing machine in any gym) toward Warfield Ridge, where the road becomes South Confederate Avenue as it winds back toward Big Round Top.