Antique Real Photo Postcard, circa. Identified as Cascada Cola de Caballo (Horse Tail Water Falls) near Monterrey, Mexico. Divided back, EKC stampbox, unused. Condition: This is an original photo postcard, not a copy or reproduction. It is in excellent condition. Comments: Cola de Caballo (Spanish, "Horse Tail") is a waterfall about 25 miles from Monterrey, Mexico, in the town of Villa de Santiago, Nuevo Leon. It is open to the public and is accessible via a walking path.