Italy
The only remaining fort on the US-Mexico border, built in 1917 to protect the US border from sustained fighting during the Mexican Revolution. The site is listed on the National Register of Historic Places and some buildings have been partially restored. Unfortunately due to vandalism most buildings
are behind a chain link fence, but they can still be seen from the road.
Listen to the audio guide for Camp Naco Free on WIP — starts by itself when you arrive, even with the screen off