Abandoned Engineering

This episode visits Lake County Sheriff's House and Jail in Indiana, a notorious American gunslinger's great escape; Chateau Aubéry on the island of Martinique, where a criminal kingpin wiped out the opposition; and Pulacayo Silver Mine, a sprawling settlement in Bolivia, the scene of an infamous shootout.

Locations include Castel Volturno in Campana in Italy, Victor Colorado in USA, and HMP Shepton Mallet in Somerset.

This episode visits Camp Hero in Long Island, a salt mine in Poland, Croatia and Lewisham.

Alps Ski Resort, is a mountainside retreat in Heul-Ri, South Korea in the shadow of a frozen conflict; Pyrenees Defence Organization, a network of defences in Spain, has recently declassified; Apollo Movie Theatre in Tbilisi, Georgia is an ornate shrine to Soviet propaganda; and Club Hotel De La Ventana is an Argentinian complex that became a surprising home for some unexpected guests.

This episode explores a country estate in Ireland where family divisions reflected a national struggle and was caught in the crossfire; a supposedly haunted ghost town deep in the Japanese forest, where teenagers test their bravery; a once famed fortress in Georgia lost to the sands of time, brought back from the dead by the discovery of a hoard of treasure; and the tranquil island of Mozambique, said to have inspired a musical legend.

Baker Hotel in Mineral Wells is a Texan retreat, frequented by the rich and infamous; Anchieta is a tropical island complex in Brazil, the scene of a dramatic uprising; McDermott Castle was a magical stronghold that inspired an Irish national hero; and Dosan Seowan Academy is the gateway to a powerful ancient order in South Korea.

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.