Havana is definitely a must-see. Visiting the old quarter of the city, the Habana Vieja, is like going back in time. Habana has preserved its pretty colonial plazas and heritage buildings. Yet, the old city is facing tremendous conservation problems. Many of its old buildings are run down and decaying. It’s proximity to the sea makes its old buildings susceptible to decay. Gotta visit Havana before things fall apart, or, God forbid, modernity destroys everything that’s old.