Empty parking garage

(Namespace: headspace)

Type A2-bcfm: subconscious nexus, blended, confining, fluid, clear memories
Occupants
None known
Connections
Mountain city Exists in this city
Mannequin city Also exists in this city (it's the same garage)
University The outdoor walkways of the academic buildings eventually blend into the parking garage
Shopping mall Hope you remember where you parked
Airport When you land wherever you were flying and try to leave the airport, you'll end up stepping out onto the roof of the parking garage

This parking structure extends infinitely both above and below ground. Almost as soon as you enter, you lose track of what floor you're on, and then you can't leave because anywhere you try to go will just be a different floor of the structure. Usually the only way out is to get to the roof and jump off.