Justo Gallego Martínez (also known as Don Justo) (born 20 September 1925 in Mejorada del Campo) is a former monk who has been constructing a cathedral-like building on his own in the town of Mejorada del Campo in the Community of Madrid, Spain, since 1961.
Don Justo has named the building Nuestra Señora del Pilar.
It has neither any planning permissions, nor the benediction of any church authority.