The team goes to Trinidad to probe claims concerning the ghost of a cocoa plantation owner in the Season 3 premiere.

A former leper colony is probed on Trinidad's Chacachacare Island; the ghosts of four murdered workers are sought at a meat packing plant in Argentina.

The team heads to Barry's homeland of Ireland to investigate two local infamous cases. The first is at Roe Valley Hospital, a site that began as a workhouse - a facility where the homeless were forced to perform grueling labor - until it was transformed into a hospital by Dr. Robinson, a woman who is said to haunt the grounds today.

The team goes to Britain in search of a she-wolf.

Probing Castle Rushen on the Isle of Man, where sightings of a ghostly girl have been reported. Also: the team goes to New Zealand to investigate a hotel, the site of an unsolved murder.

The team probes New Zealand's Napier Prison, where phantom footfalls and disembodied threats have been heard and doors have allegedly closed by themselves.

Claims of paranormal activity and legends of a magical stone are probed in Peru's Chavin ruins.

The team heads to the Fort of Fenestrelle in Turin, Italy. This massive fortress will require the team to climb 4,000 steps to reach the investigation site. There is a prison in which hundreds died, including a man who had been forced to hide his face behind an iron mask as punishment for his crimes. Locals believe this man is haunting the prison and fortress- and one witness claims to have seen the apparition of the man with burning red eyes! In the officer's prison, people speculate that the man with the iron mask was a relative— either an identical twin, illegitimate child or distant relative — to the king. As he was a threat to the crown, he was imprisoned and forced to cover his face. A resident walking his dog once saw the man with the iron mask, and his dog went crazy over it.

In San Ignacio, Belize the team investigates caves that the ancient Mayans believed were the first of nine layers to the underworld. The caves were the sites of numerous human sacrifices, including that of the Crystal Maiden, whose bones have been there so long they have crystallized into the cave floor. Claims at the cave, as reported by cave guide Emil Gamez, include chanting noises, balls of fiery light and spirits that pass through people's bodies. In the tomb-like area of the Crystal Maiden people feel strange energy, a sense of unwelcome and glowing lights around the Maiden.

The team tries to help a man who is being tormented by spirits from the Mayan ruins of Cahal Pech; one team member takes part in a ritual to contact Mayan spirits.

The team investigates an abandoned all girls' school in American Samoa; It is believed that the Samoan Chief possessed and killed schoolgirls.

The team heads to Belgium seeking the ghost of a fallen soldier. Then, they head to Frankenstein's birthplace.

The Ghost Hunters International team travel to Lower Fort Garry in Manitoba, Canada, which was originally built to protect the fur trade. Paranormal activity has increased in recent months!