Carlsbad Cave National Monument was created in 1923.
In 1930, US Congress created Carlsbad Caverns National Park from the same area previously protected as Carlsbad Cave National Monument by President Calvin Coolidge.
Russell Cave National Monument was created in 1961.
Timpanogos Cave National Monument was created in 1922.
US Congress changed the designation and the name of Carlsbad Cave National Monument, created in 1923, to Carlsbad Caverns National Park in 1930. Carlsbad Cavern, without the "s", is the name of the main tour cave. There are 117 caves known in the park.
The area of Russell Cave National Monument is 1,254,525.490944 square meters.
The area of Timpanogos Cave National Monument is 1,011,714.1056 square meters.
Russell Cave National Monument
Yes, the cave is natural.
I am presuming you mean, "Lechuguilla Cave" which is located in Carlsbad Caverns National Park, New Mexico
There are 117 known caves within Carlsbad Caverns National Park.
Jewel Cave was set aside as a National Monument by Theodore Roosevelt on February 7, 1908.
Technically, it's not a monument but a national park. This designation is by federal legislation.