Satellite images capture the Hill of Tara, two conjoined circular structures embedded in Ireland's lush and rolling landscape. Experts investigate the ancient site used to crown the legendary High Kings of Ireland at the Stone of Destiny and the elusive hunt for the Ark of the Covenant by the British Israelites in the 1890s.

Satellite images capture a series of enormous zigzagging patterns carved into the remote woodlands of Poland; experts investigate a clandestine Nazi base linked to a doomed operation that played a pivotal role in the downfall of WWII Germany.