Hamilton has amassed an extraordinary collection of Nazi memorabilia. These include a collection of Nazi badges that were sold to raise money for the German poor, and an ammunition box full of silver bullion bars that were found buried close to a concentration camp in Poland. The badges incorporate many symbols from other ancient religions and cultures that the Nazis used to promote the myth of an Aryan master race.

In Hamilton's possession is a wooden chest stuffed full of relics from medieval Christian pilgrimages. These include clamshell pendants from the Camino de Santiago in Spain and Jerusalem crosses from the Holy Land. In addition, Hamilton has two stone carvings. One is of a pilgrim clad in a cloak and carrying a book and staff; the other is very similar except that he is carrying a spear.

Carl and Hamilton are back on more familiar ground with a stunning white marble chalice from Hamilton's Knights Templar treasure hoard, where the relics they explored in the first series came from.

Carl and Hamilton investigate an extraordinary collection of Celtic gold from the Iberian Peninsula that dates back thousands of years. Amongst the rare artefacts are a gold bowl worth over £1m, fine pieces of jewellery depicting the goddess Astarte, and a stone altar to the god Endovelicus which might have been used in rituals that involved blood sacrifice.

Carl Cookson and Hamilton White investigate a Crusader sword and helmet that date back more than 900 years. Oxford historian Dr Janina Ramirez helps them decode the symbolism on these ancient relics to show that the sword may have been used in the First Crusade when Christian knights retook the holy city of Jerusalem, and that the helmet, embossed with the Lion of St Mark, was made in Venice.