Texas Subcategories This category has the following 8 subcategories, out of 8 total. Parks by century of establishment (5 C)0–9 Protected areas established in the 11th century (1 P) Protected areas established in the 16th century (1 P) Protected areas established in the 17th century (3 P) Protected areas established in the 18th century (3 C) Protected areas established in the 19th century (9 C, 1 P) Protected areas established in the 20th century (11 C, 1 P) Protected areas established in the 21st century (4 C)