This medieval helmet is suspected to have been owned by Heinrich Himmler. Thought to have been made in the 13th century, it is designed in the style favoured by medieval knights.

The black obsidian chalice, the most stunning relic in Hamilton and Carl's collection, is examined. The pair then head to Portugal to hunt for clues about the chalice's creation. Returning to the UK, the duo investigate its purpose.

Featuring the most dramatic object in Carl and Hamilton's collection, the stunning Knights Templar Sword, which they believe might have been used at the infamous Battle of Acre.

A look at what is arguably the most intriguing item in Carl and Hamilton's collection: the 15th century reliquary casket. Although originating from a later period, a series of engravings on it appear to make veiled references to Templar beliefs.

Two treasure hunters investigate a sword and helmet that date back more than 900 years; they work to decode the symbolism on the ancient relics and discover the sword was used in the First Crusade when Christian knights took control of Jerusalem.

Treasure hunters investigate an extraordinary collection of Celtic gold from the Iberian Peninsula that dates back thousands of years, including a rare gold bowl and a stone altar to the god Endovelicus that may have been used in ritual sacrifices.