Building a National Park has multiple requirements that can be complicated to understand. These are the 4 requirements to create the park: • Tile-type: The tiles must be Natural Wonders, Mountains, or tiles that have Appeal. • City: All 4 tiles must be owned by the same city. • Shape: All the connected tiles will form a diamond shape. Therefore, you need to much sure the tiles are not occupied in this form. • Undeveloped Tiles: The 4 tiles must not have any district or improvement because otherwise, the Naturalist won't be able to build the National Park. If these conditions are met, you can move the Naturalist to build the National Park. Remember that you want the tiles to have a higher Appeal score to generate lots of Culture each turn.