Grebeni is little island very near coast of Dubrovnik with lighthouse on it.
Lighthouse was built on it 150 years ago to prevent constant collisions of ships with the island.
In the surrounding underwater area there are lots of shipwrecks which are main attractions
for scuba divers.
Also in the year 1958 during the big storm the sea has picked up a giant rock from the bottom of the sea and collision with the lighthouse window which is 15 meters high was enough to crew leave the lighthouse forever. It was the first lighthouse in the Adriatic sea that was abandonded by crew.
Nowdays during the summer you can even rent the island for a get away from civilization.