Wemyss Caves, on the shore of the Firth of Forth, have been a famous landmark for centuries. Legend has it that they were occupied by the mysterious Pictish people who scared the Romans into building Hadrian's Wall; that subsequently they were home to medieval Christian hermits and later to Jacobean nobles. Now the caves are under serious threat from erosion; the sea is already lapping at the cliff just below the cave line.

But Wemyss Caves have never been properly investigated. How did the enigmatic Pictish carvings on the cave wall get there? And did Picts really live in the caves or were they just passing by? Is there any evidence of hermits or other types of medieval occupation? In an intensive three days, Time Team come up with some remarkable answers, beginning the task of re-writing the history of this atmospheric site.