In deepest Wales lies an extraordinary site, with a Megalith, a Neolithic tomb, a Norman watchtower, early Christian symbols, and a natural spring. From this spring, the landowner has recovered an astonishing variety of coins, sculptures and jewelry. It is almost too good to be true, rather like an ancient theme park. So begins one of Time Team's most remarkable digs. Geophysics shows no structure anywhere on the site. The megalith is far too shallow to have stayed upright for thousands of years. And when the team unearth a sword, they start to get suspicious. They are joined by Celtic ritual expert Miranda Green, architectural historian Will Hughes, and Iron Age specialist Ian Stead. Results show that the site has been 'salted' and the finds have all been placed or build between the 19th century and as late as the 1980s. More info can be found at Llygadwy.

• Tim Taylor

• Tony Robinson
• Bill Oddie
• Phil Harding