Abstract: A frameless shelter is disclosed constructed of a plurality of spherically shaped panel sections having the same radius of curvature and fabricated from a sunlight transmitting plastic adapted to be assembled together to form a dome structure. The panel sections are formed with U-shaped channel edges adapted to nest together with the contiguous edges of adjacent panels so as to provide vertically extending stiffener ribs so that a separate frame is not required, and at the same time act as locating means for the panels so that the dome may be readily assembled. The edges of the lowermost tier of panels rest in a channel support extending about the periphery thereof and resting on footings at ground level or on a wall structure extending above the ground. A center pole reinforcement is also included which also provides an electrical conduit for an electrically operated exhaust fan which may be included.