Just a reminder: when it comes to being armed in a National Park, most parks that share concurrent law enforcement jurisdiction with the states in which they are located will honor state law when it comes to concealed and open carry. Best to check their website for any updates, but I believe Teton and Yellowstone are concurrent with WY.
Regardless, when it comes to National Parks, you cannot legally enter any federal building armed, if that building is staffed by federal employees. That includes Visitor Centers, Administration buildings, etc. and the entrances will be signed to that effect. Concessions contractors that run food and souvenir services may have different policies for the buildings they lease on park land, but they typically follow suit with the park policy of excluding firearms in their buildings.
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