Presidio Modelo
Presidio Modelo (Model Prison) was a former “model prison” of Panopticon design, located on the Isla de la Juventud in Cuba, built between 1926 and 1931, during the repressive regime of Gerardo Machado.
Bayantal Abandoned Soviet Airbase
Built in the 1970s, this air base in Mongolia had a 2-mile-long runway and was seen as a frontline for any possible conflict with China.