By definition, national monuments are singled out for protection because they have one compelling cultural or natural feature. (The 1,267-foot Devils Tower in Wyoming is a good example; it became the first one in 1906.) National parks, on the other hand, have numerous natural wonders that make them worthy of a higher level of land protection. Presidents may create national monuments with the stroke of a pen — without congressional approval — thanks to the Antiquities Act of 1906, signed by preservation-minded President Teddy Roosevelt.
Here are quick looks at the 14.