On September 24, 1906, President Theodore Roosevelt dedicated the first U.S. national monument. What was it?

RappingRaven6959, l love mountains and I use to live in the Cascade Mountains, in Oregon, right on the Columbia River. it was awesome!! A must see! Oregon has 4 climates. The mountains, the Willamette Valley, the Pacific Ocean, the desert in Eastern Oregon. There is one more but it escapes me right now!

Sounds like a place I would love to visit