The world's Most Spectacular Sea-caves

Many 'sea caves' are famous among the watersports community - largely because you have to strap on a pair of flippers and an air tank to explore sights such as Belize's Great Blue Hole.

But the relentless action of the waves over millennia has carved out some spectacular caves that you don't even need a snorkel to explore such as Fingal's Cave in Scotland - just a sturdy pair of boots.

Fingal's Cave, on the uninhabited island of Staffa in Scotland, showcases unique, unspoiled geography - and was reputed to be home to a giant who built a causeway between Scotland and Ireland.