Once a major U.S. military hospital during the Vietnam War, Clark Air Base Hospital was abandoned after the 1991 eruption of Mount Pinatubo. Left in ruin, the hospital is notorious for apparitions of soldiers and patients, disembodied screams, and shadowy figures moving through the wards. Ghost hunters and YouTubers filming inside frequently report EVPs and sudden cold spots, solidifying its reputation as one of the most haunted places in the Philippines.