Sky History 2 HD Tuesday

The experiences of Paul Bennewitz, who crossed the US military after believing he had found a top secret human and alien underground lab in Dulce, New Mexico near Los Alamos

Hugh Dennis and a team of expert archaeologists are in the market town of Masham in North Yorkshire, hoping to find a Viking burial ground hidden underneath

Alice Roberts heads to the south of England to see the earliest money made in Britain and a massive haul of Roman treasure that brings to life the fall of the empire in Britain

The planet's most puzzling structures are revealed, including ancient pathways criss-crossing Easter Island and gigantic designs carved into Asia's Eastern Steppe

Scott and Sheldon visit a collector whose house is crammed with items ranging from velvet Elvis paintings to thousands of rare LPs

Through history, mankind has credited its existence to otherworldly beings. This programme contemplates whether any proof can be found in these early beliefs