Olympus Coliseum has been a staple of the Kingdom Hearts series since the beginning, appearing in every game except Dream Drop Distance. While Kingdom Hearts II let us explore the Underworld and Birth by Sleep gave us a brief foray into town, we really haven't gotten to leave the Coliseum much otherwise.
The Kingdom Hearts III trailer brings us all over, sending us up and down grassy mountainsides and into battle with the Rock Titan. With the recently announced collaboration with Disney animators, we'll be able to explore the world of Hercules like never before. Hopefully all of the worlds will be this expansive.