On the unenclosed moorland, there are extensive areas of blanket bog on deep peat soils. Much has been unenclosed moorland since mediaeval times, with few houses. Today the fortress of Arsa lies in mostly unenclosed and unprotected ruins. Cattle grids prevent egress of grazing stock from unenclosed areas of the hills. Bungalows are one or one-and-a-half-story houses, with sloping roofs and eaves showing unenclosed rafters. An open floor plan is one which values wide, unenclosed spaces. The Boulevard is an unenclosed area of the mall that opened in 2008. The dump is unenclosed, and the tipping process is uncontrolled. Some communities of canonesses developed unenclosed institutes of Religious Sisters to complement their activity. Heartland Town Centre is an unenclosed outlet mall with 180 stores and restaurants. Another factor is the survival of large areas of unenclosed forest. The unenclosed land about their cities could not be sold. Some cities have short two-station unenclosed inclined railway lines that serve the same function. These are the remains of a small agricultural settlement which was unenclosed.