Disney’s Tunnel Systems

The Magic Kingdom theme park at Walt Disney World is actually the 2nd floor of a massive complex built underground, connected via massive tunnels known as utilidors (utility corridors). This is where a lot of the nut-and-bolts stuff, like trash removal and computer systems (which coordinate the parades and the timed operations of the park), are handled and housed.
It’s also where the costumed Cast Members report to work, grab something to eat, and get dressed. They’ll travel, via the tunnels, to the area underneath their assigned ‘Lands,’ and then go ‘upstairs’ to interact with Guests. This is why you never see an astronaut walking through Tomorrowland, or an American colonist walking through Adventureland. The only way a non-Disney Parks employee can see the tunnels is by going on the aforementioned “Keys to the Kingdom” tour, which includes a walkaround of the facility.