Wellfleet Fire and Rescue responded to a call about two buildings that were burnt down Saturday morning.
The incident happened at approximately 11 a.m. off Ocean View Drive in the wooded area near Newcomb Hollow Road.
Firefighters on scene discovered the burnt ashes of an unoccupied wood house located on National Seashore property.
Crews also found the charred remains of another home, which was also vacant.
Officials with the National Park Service and the Wellfleet Fire Department are investigating the cause of both fires.