Season 12

Exploring Chateau Aubery on the island of Martinique, where a criminal kingpin wiped out the opposition.

Exploring Castel Volturno in Campana in Italy, Colorado and HMP Shepton Mallet in Somerset.

Exploring Camp Hero in Long Island, and a salt mine in Poland.

Exploring the Apollo Movie Theatre in Tbilisi, Georgia, an ornate shrine to Soviet propaganda.

Exploring a country estate in Ireland where family divisions reflected a national struggle and was caught in the crossfire.

Exploring Anchieta, a tropical island complex in Brazil and the scene of a dramatic uprising.

Exploring the ruined site of Troy, that helped decode one of the world's most enduring mysteries.

Exploring Seodaemun Prison, a facility in Seoul that helped spawn a legend known as South Korea's Joan of Arc.