GHI invesdtigates a Belgian fortress in Antwerp and a 16th-century Italian villa.
The team looks into claims involving an abandoned girls' school in American Samoa.
The Mayan Ruins of Cahal Pech are investigated in San Ignacio, Belize, where a paranormal investigator takes part in a ritual to speak with the dead.
The team visits San Ignacio, Belize, to look into claims tied to the Actun Tunichil Muknal cave. Later, the Chateau de Fougeret is investigated in Queaux, France.
Italy's Fort of Fenestrelle is investigated this week.
GHI investigates claims of paranormal activity and legends of a magical stone at Peru's Chavin ruins.
GHI visit New Zealand's Napier Prison.
GHI travel to Norfolk, England to investigate Castle Rising castle.
Barry returns to Northern Ireland to investigate the former Limavady Workhouse, which was later converted into the Roe Valley Hospital before closing in 1997. GHI also visits Spike Island, nicknamed Ireland's Alcatraz.
GHI investigates a former leper colony on Trinidad's Chacachacare Island. Then they fly to Argentina to look into the claims of paranormal activity said to be caused by the ghosts of four murdered workers at the Frigorifico Meat Packing Plant.
GHI returns for its third season in the rainforest of Trinidad to search for the spirit of Count Lopinot, a cruel slave master, who is said to rise from his grave at his former cocoa plantation La Reconnaissance.