Immediately below Cliff House, reached via steps from the Gate House and through a slate archway, is the cliff top Rotunda or Grotto (1960, listed Grade II 1971). This comprises a lookout platform above a shell Grotto. This semi-circular single storey flat topped structure with central Astrolabe was built to add an intriguing item to the Portmeirion panorama from the sea, and also provides a commanding viewing platform overlooking the whole estuary. Seen from the sea it resembles a defensive bunker or look out post guarding the shoreline. The shell grotto contrived beneath it has five openings and its walls and ceiling are inlaid with a profusion of local shells. A path leads from the Grotto through the cliffside woods down some quite steep steps through several loggias to the shoreline pathway and the Amis Reunis stone boat.