Rabbit warren

Generated image of hospital corridors
A place is like a rabbit warren if it has many small rooms, passages, or paths that are confusing to move through. This idiom is used when a building or area is easy to get lost in.

The expression comes from the underground burrows where rabbits live. A real rabbit warren is made of many twisting tunnels and chambers, which makes it easy to get lost inside.

The older part of the hospital is a rabbit warren of narrow corridors and small rooms.