Dorset

   This famous Victorian fort located at the entrance to Weymouth Harbour was built in 1872 to protect the Royal Navy base at Portland Harbour. The fort later played an important role in World War II, but was eventually abandoned in 1956.
The fort is now a museum on three levels with a labyrinth of underground passageways, and outdoor areas with stunning views of the Jurassic Coast as seen here. It will also be an excellent vantage point for watching the sailing events at the 2012 Olympics.