Investigation Summary
The Sanatório de Mont'Alto (Sanatório de Valongo), on the Serra de Santa Justa, was a tuberculosis sanatorium inaugurated in 1958 and closed in 1975 — reportedly overcrowded, with deaths on site. Now a fire-damaged ruin, it has become a focus of dark tourism and ghost stories. PRN treats the documented illness and death soberly.
Recorded by PRN as a reported/folkloric case — historical context, not proof.
Henrique Matos — CC BY 2.5, via Wikimedia Commons