Two bases. One wall. A shit-ton of crockets.
A TF2 port of the classic, popular Unreal Tournament map CTF-Lavagiant, with a slightly tweaked layout and slightly scaled down from the original in order to compensate for TF2's slower game pace.
Sky Giant, an asymmetrical Capture The Flag map, takes place on a foggy floating island, where Red Base and Blue Base (each with their own unique design and layout) are seperated by a huge rocky wall. There are five passages through the wall (three high and two low ones), as well as a chamber inside the wall with a full ammo pickup (where the Redeemer could be found in the original).
Unlike the original, Sky Giant allows the player to teleport from the spawn room to one of three locations of choice near his or her base, in order to reduce the risk of spawn camping.
Also, I playerclipped off the top of the wall to prevent players from being picked off before they even leave their base, which would be unfair for obvious reasons.