Big Spot (stylized Big Sp!t) is a large store which first appeared in Season 4 of AMC's The Walking Dead. It is mainly based upon its real-life counterpart Big Lots!. It was abandoned and speculated to be used as a base for the U.S. Military - United States Marine Corps, specifically (this is because "USMC" appears on one of the vehicles).
When the outbreak began, a military outpost was set up at the entrance of the store, but was later abandoned for unknown reasons. At some point in time, a helicopter crashed onto the roof (the survivors of the incident were mostly likely eaten). Overtime, the wreckage slowly weakened the roof of the store.
About seventeen months into the outbreak, a group of survivors stationed in the nearby West Georgia Correctional Facility spotted the location, overrun with walkers (most likely the original survivors gone there for refuge). They set up a boombox and blared music to lure them out, preparing the store for a later sweep.
Those survivors, Daryl Dixon, Michonne, Sasha Williams, Tyreese Williams, Glenn Rhee, Zach, and Bob Stookey, return to the store three days later to scavenge it for supplies. Upon their entrance, it seems to be relatively safe. Unbeknownst to them, there is the helicopter on the roof, which is seriously compromised at this point. Once the walkers begin falling in one at a time, the calm devolves into chaos. In the midst of this confusion, Zach is grabbed by a walker and bitten when the roof collapses in. The group quickly flees from the store to avoid any more deaths.
U.S. Armed Forces (Previously)
Zach - Was bitten on the leg by a walker and was later devoured before he and the walker were crushed by a falling helicopter from on top of the roof.
Military helicopter crew, possibly numerous counts of refugees
The Big Spot is a sector guests go through inside the Orlando version of the The Walking Dead: End of the Line house at Halloween Horror Nights. One critique of this sector said that most of the merchandise is actually from Dollar Tree.