Manadatory Credit: Photo by Stuart Forster / Rex Features (1309590AF)
The mysterious "Compass Rose" or "Rosa dos Vertos" at Sagres Fort on the Algarve in Portugal. The 43 metre in circumference pebble circle was discovered in 1921. It's purpose is not known as the circle has 40 segments rather than the 32 that compass roses normally have.
Portugal - Nov 2010