Realms Between

Summary
Just as there is a grand multiverse, there are many, many microverses that populate this world of ours. These microverses are often quite unstable with strange rules that vary from ours significantly. Here are a list of a few important ones that have been featured thus far:

Waffle House
Every Waffle House is actually a portal to the same Realm Between, and it is a popular bus stop/meeting place for creatures not of this world. You can enter any Waffle House in the world and end up in the same restaurant. Waffle House has become something of a bad omen. If a Waffle House has more than the standard 4 health code violations, it's a bad sign. It only closes on the day of the apocalypse.