Search the indicated locations to find all seven Snow Globes:

Goodsprings: In Goodsprings Cemetery, at the foot of the small rectangular gravestone, near where the earth has been dug up, close to the water tower.
Mormon Fort: In Old Mormon Fort, inside the same tower as Julie Farkas' office, on top of a wooden bookcase.
Test Site: In Lucky 38 Casino, in the cocktail lounge, on the curved sideboard across from the entrance, behind the till.
The Strip: In Vault 21, inside Sarah's locked bedroom, between the two beds, on a small table.
Nellis AFB: In Nellis Air Force Base, inside Pete's museum, on the corner table by the mural.
Hoover Dam: In Hoover Dam, on a desk in the visitor's center, by a terminal.
Mt. Charleston: In Jacobstown, on the large curved desk in the reception area of the lodge, near the terminals.