Accessible through the southern side of the structure, just beyond the "River of Quantum." Just left of the building's sign is an "enter" sign with an arrow. Follow it to the entrance of the building. Upon entering, one will be in the newest feature within the "World of Refreshment," the "River of Quantum," which snakes through the structure. One will be able to hear the history of Nuka-Cola accompanied by sets that illustrate the story.
Hidden Cappy clue - In the western town section of the Quantum River tour, on the left side of the river directly across from a large Nuka WILD sign on a blue building with a western female model, will be located on the right side of said building.
Nuka T-51 power armor - Behind a sealed door next to the Tunnel of Love. The door is unlocked by an Expert locked terminal in the upper area. It can be reached by proceeding eastward from the armor, entering the hole in the right wall and going up the stairs. If needed, the password to the terminal is located on the roof by a Nukalurk king, a mattress, and two weapon workbenches.
The following is based on unverified behind the scenes information and has not been confirmed by canon sources.
The River of Quantum may be a reference to the chocolate river in the children's book Charlie and the Chocolate Factory. While drinking out of the chocolate river in Wonka's factory was forbidden, a terminal entry found inside the World of Refreshment encourages employees to drink out of the river as Quantum's chemical makeup kills any germs it touches.
End of information based on unverified behind the scenes information.