Georgia Aquarium's newest and biggest addition - its sixth permanent gallery - is to open on 2 April.

A US$110m (£68m), three-year project, AT&T Dolphin Tales focuses on creating a greater understanding of dolphins, traditionally the most-requested animal by visitors to the aquarium.

Incorporating a number of different spaces, the new PGAV Destinations-designed gallery includes an entrance lobby featuring a 25ft (7.6m) underwater viewing window.

The lobby leads to the AT&T Dolphin Tales theatre, an enclosed facility designed and built as a backdrop for a show involving dolphins and live actors, and featuring special theatrical effects.

Bernie Marcus, benefactor and CEO of the Georgia Aquarium said: "This is a significant new addition to the aquarium. The introduction of these graceful and playful dolphins is a must-see experience, which will entertain and delight our guests in a whole new way."

AT&T worked with the aquarium to develop and support a number of different tools aimed at highlighting and promoting dolphin-, gallery- and show-related content, both in person at the aquarium and online.

The Georgia Aquarium - located in Atlanta, Georgia - is the world's largest, with more than ten million gallons of water and the largest collection of aquatic animals.