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 Groff and Katrina Weidman visit Wildwood Sanitorium, New York. After its conversion into apartments, tenants have reported an unnerving male presence and furniture being rearranged.

Paranormal investigators Nick Groff and Katrina Weidman visit the now former Higginsport School in Ohio.

Ghost hunters Nick Groff and Katrina Weidman visit Kentucky's Jim Beam Distillery, exploring employee claims that bourbon is not the only spirit locked inside its huge warehouse.

Nick and Katrina Weidman explore the Cambria County Jail in Pennsylvania, which once housed the area's worst criminals, staging executions in its early days.

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 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.

In the season two premiere, Nick and Katrina spend 72 hours for their lockdown at Indiana's most haunted house on Monroe Street, where they unearth skeletal remains in the crawlspace during their investigation, which is cause for them to notify the local police.

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.

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 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.

Nick and Katrina travel to Buffalo for their largest lockdown at the Statler City Hotel, once the 'grand dame' of hotels in the Roaring Twenties where famous mobsters, including Al Capone, spent the night. During their investigation, they try to make contact with a lonely young woman who committed suicide by jumping out of an 8th floor window in 1947.

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.

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 head to New Orleans to investigate the murder/suicide surrounding the small house on Rampart Street. It involves the relationship between Zack and Addie who came together during hurricane Katrina. After they survive the storm and chaos, things go terribly wrong with Zack killing Addie and then taking his own life.

After the owner's tragic death, a Victorian mansion reportedly curses all who dare to inhabit it. Nick and Katrina find the curse may be even more dangerous than they anticipated.

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 investigate the abandoned and haunted Trans-Allegheny Lunatic Asylum in Weston, West Virginia. What Nick and Katrina capture on their third night of confinement can only be described as groundbreaking and completely terrifying.

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.

Nick Groff and Katrina Weidman arrive in Cleveland, Ohio to investigate a Victorian mansion’s haunted secrets.  Over the course of their 72-hour investigation, Nick and Katrina capture unnerving voices pleading for help.

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.

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 are in Staten Island, New York to seek answers on who is haunting the infamous Kreischer Mansion. Legend states that during the late 1800's several seances were conducted inside the mansion.

A 2 hour special investigation of the Black Monk House in Yorkshire, England – universally feared as the home of the most violent poltergeist activity ever reported. Groff and Weidman will confine themselves to the infamous house for a record-breaking 100 hours, the longest paranormal investigation ever on television, in an attempt to capture the most convincing paranormal evidence ever to be recorded.

Nick and Katrina dedicate this one-hour special to reveal the new evidence they found in their investigations during their season one lockdowns.