In this 4-part episode, the show visits: 1) Byron Hot Springs in California, site of a luxury resort that became a WWII prisoner interrogation center, 2) Slains Castle in Scotland that inspired the book "Dracula", 3) the post-Soviet era remains of the Estonian town Viivikonna, and 4) the site of the ruins of the ancient city of Ani in Turkey, where a church may have held a piece of the True Cross.
—Mark H.