Nick Groff & Katrina Weidman investigate Shepton Mallet, a former prison located in Somerset, England

Nick Groff and Katrina Weidman immerse themselves in the vast Drakelow Tunnels, a former top secret underground military complex beneath Kingsford Country Park north of Kidderminster, Worcestershire. They investigate the stories of shadowed figures and dark entities that lurk underground.

Powerful spirits are said to haunt Winchester's historic Royal Oak Pub and its owner. Nick Groff and Katrina Weidman try to investigate why the spirits are unable to rest in peace.

To help the new owner of the Abandoned Park Hotel, Nick and Katrina explore the claims of ghostly activity and echoes of the once-luxurious property’s past.

Nick Groff and Katrina Weidman have researched the haunting at Liverpool’s Newsham Park Hospital for years. After 72 hours in the former orphanage, they question their preconceptions about the former medical facility, now grade II listed building.

A Lincolnshire family hit by decades of hauntings calls Nick Groff and Katrina Weidman for help. However, during the investigation in Skegness, the activity is traced to an unexpected origin

The sprawling Margam Castle property has been considered sacred land for over 4,000 years. Nick and Katrina must face a lurking presence in the decadent Welsh home.

Nick and Katrina pursue a negative presence in the haunted Mill Street Barracks. During their investigation, they are followed by an unexpected entity.

For decades, staff and patrons of The Kenton Theatre have seen the spirit of a notorious local murderess. Could there be more lurking in the wings?

The historic Hinchingbrooke estate has hosted English royalty and nobles – but it also reportedly harbours a horrific haunting. Nick and Katrina investigate.

A threatening presence brings the construction on the Beattie Mansion to a standstill. Nick and Katrina use cutting edge experiments to lure out the ominous spirits.

Nick and Katrina submerge themselves among the spirits of West Virginia's Old Sweet Springs Resort. What lurks beneath the surface at this once-idyllic retreat?

Nick and Katrina head to Kentucky for their 72-hour lockdown inside the infamous Waverly Hills Sanatorium, a former tuberculosis hospital that's one of the most paranormally active locations in the country. They investigate the sightings of the legendary shadow figures and hauntings in the "body chute", a 150-meter tunnel where bodies were dumped.

Nick and Katrina use high-tech equipment to face down the dark spirits in one of America's most notorious haunted hotspots - Bobby Mackey's Music World.

After Nick and Katrina found human bones in their first lockdown at the Monroe House, they thought the case was closed. Now they return to explore further.

A house in Hinsdale, New York draws Nick and Katrina to investigate its demonic past, and Nick is caught in a psychological war against good and evil.

Nick and Katrina unlock the foreboding secrets of England's HM Prison Shrewsbury, which opened in 1793. For their 72-hour lockdown, they face 220 years of public executions, suicides, and tragedy, including the prison's last hanging of a possible innocent inmate in 1961.

Nick and Katrina spend 72 hours during their lockdown in the historic Oliver House, an estate built in 1769 by loyalist Dr. Peter Oliver Jr., who was banished from the home by an American Revolution mob. The house has seen many tragedies, including children's deaths, and a plague that wiped out most of the Wampanoag population out in the woods.

Nick and Katrina get locked down in the St. Ignatius Hospital in Colfax, Washington. Built in 1893 by the Sisters of Providence, this former facility is currently a decrepit building filled with the spirits of patients who died from the flu epidemic that swept through the state in the late 1900s.

Drawn to small town Iowa by reports of aggressive shadow figures, Nick and Katrina venture to the harrowing halls of Malvern Manor.

Nick and Katrina delve into uncharted territory in a haunted jail in Savannah. Riddled by phantom noises, they suddenly find that they are not the only ones locked in the Old Chatham County Jail.

Nick and Katrina travel to southeastern Ohio to spend three days locked down in the Bellaire House, built in 1909 by miner Jacob Heatherington. The home was passed through the family until his descendant Lyde, who died here. Her brother Edwin, devastated by her loss, hired mediums to contact her, which opened portals, allowing negative spirits in.

The White Hill mansion in Fieldsboro, N.J., may contain visual evidence of a child in the attic, but its alleged history as a mob hangout have Nick and Katrina questioning if all the spirits they encounter are that innocent.

When the Anderson Hotel in Lawrenceburg, Kentucky closed its doors, not everyone checked out.  Over their 72-hour confinement, Nick and Katrina watch helplessly as their cameraman is savagely bitten.

When Nick and Katrina arrive to investigate residual hauntings inside the long-shuttered Randolph County Infirmary in Winchester, Indiana, they are alarmed to discover not every resident has left.