1.   A cluster of seven ramshackle houses built on weathered pilings, the structures dot the shallow waters of Biscayne Bay like shipwrecks.

2.   Across these islands, he explains, rounded structures dot the coves and hillsides.

3.   He said his research indicated other equally promising oil structures dotted through the Caspian waters off Kazakhstan, Russia and Iran.

4.   Impressive new athletic structures dot the cityscape.