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 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.

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 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 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.