The T. Matthew Fraggle Room is a special cavern, located just beneath the main caves of Fraggle Rock. The cavern consists of a maze-like collection of passage ways, each marked by an arch. When touched, the arches transport a traveler to a distant place with a gust of wind and light. Most of the arches lead to different places in Outer Space. One particular arch leads to a completely different dimension, the land of golden apples, guarded by the Blue Dragon.

The cavern was discovered by Uncle Traveling Matt in "Uncle Matt's Discovery", and soon becomes a favored alternative entrance to and from Fraggle Rock. Uncle Matt names the room after himself (a fact revealed in "Red's Blue Dragon"), and constructs an entrance way, consisting of a Fraggle scarecrow, which when rotated, opens a trapdoor which leads to the cavern below.

Some of the areas the arches allows anyone to visit include.

• The room of a little girl.
• Australia.
• Somewhere near The Captain's Inn.
• The Land Where the Golden Apples Grow.
• Underneath the porch of Doc's Workshop.