Seaside Sanatorium was constructed in Waterford, Connecticut, during the early twentieth century as a medical facility designed to address the tuberculosis epidemic that was ravaging American society during that period. The building was designed by the renowned architect Cass Gilbert, an architect of international reputation who also designed the United States Supreme Court Building in Washington, D.C., and the iconic Woolworth Building in New York City, two of the most significant architectural achievements of their era. The selection of such a prestigious architect for the sanatorium's design reflects the seriousness with which American society viewed tuberculosis treatment and the considerable resources that were devoted to constructing facilities deemed capable of addressing this devastating disease. The architectural design of Seaside Sanatorium combined functional medical facilities with aesthetic design principles, creating a building intended to inspire hope and facilitate healing among its patients. The sanatorium was established as an institution dedicated to treating tubercular patients with the best available medical knowledge and facilities of the early twentieth century, operating under the medical theories and treatment protocols that guided tuberculosis care during that era. During its initial decades of operation, Seaside Sanatorium served its intended purpose as a tuberculosis treatment facility, admitting patients suffering from this devastating infectious disease and attempting to cure or arrest the progression of the illness through available medical treatments and the healthful environment provided by the facility. However, as the twentieth century progressed and medical treatments for tuberculosis improved, the primary function of the facility gradually shifted. By the mid-twentieth century, Seaside Sanatorium was increasingly utilized to house elderly patients and individuals with mental disabilities and developmental disorders, populations for whom custodial care and institutional housing were deemed necessary. The facility transformed from a specialized tuberculosis hospital into a general institutional residence, housing growing numbers of vulnerable and dependent populations whose families were unable or unwilling to care for them in domestic settings. This shift in the facility's primary function coincided with increasing reports of deficient care, inadequate conditions, and an unacceptably high mortality rate among residents, particularly during the latter half of the twentieth century. The latter decades of Seaside Sanatorium's operation were marked by systematic abuse of residents, grossly inadequate care, poor sanitation and living conditions, and a death rate among the institutionalized population that far exceeded what would be expected based on the ages and conditions of the residents. Historical investigations and staff accounts document numerous instances of abuse of vulnerable patients, neglect of basic medical and personal care needs, and a pervasive institutional culture that devalued the lives and dignity of the institutionalized population. Researchers have documented evidence of direct physical abuse, restraint of residents without medical justification, deliberate withholding of medical care, and an atmosphere of institutional neglect that characterized the facility's operations during its final decades. The compounding effect of tuberculosis deaths during the facility's earlier decades, followed by the institutional abuse and neglect of subsequent decades, created a location saturated with human suffering, premature death, and spiritual trauma of extraordinary intensity. Seaside Sanatorium finally closed its doors in 1996, ending nearly a century of continuous institutional operations and marking the end of the deliberate abuse and neglect that had characterized the facility's latter decades. Following closure, the building fell into progressive disrepair, with many structures on the property becoming increasingly dilapidated and unsafe. In 2014, the property was formally designated as Seaside State Park, placing it under governmental protection and management as a historical site. However, the buildings themselves remain largely inaccessible to the general public, with structures closed to visitation and protected against casual exploration due to the condition of the buildings and concerns regarding public safety. The closure of the buildings to public access has not, however, eliminated the profound paranormal phenomena that manifest throughout the property, suggesting that the spiritual imprints left by the suffering, abuse, and death that occurred within the buildings persist despite the facility's physical closure.