DOWNTOWN Located north of Centennial Olympic Park, a massive glass and steel prow beckons modern explorers to discover the wonders that lie deep within the Georgia Aquarium, the largest Aquarium in the world. Exotic batfish, sea goblins and bowmouth guitarfish are among 100,000 fish and marine animals patrolling the 6-plus million gallons of the deep water exhibit, which is home to two of the state's most prodigious residents -a pair of whale sharks named Ralph and Norton. The Westin Peachtree Plaza Aquarium Packages