Plaza de Armas is the oldest and most historic square in Havana, located in the heart of Old Havana near the harbour. The square is shaded by ceiba trees and surrounded by some of the finest colonial buildings in the city: the Castillo de la Real Fuerza (the oldest surviving Spanish fort in the Americas), the Palacio de los Capitanes Generales (now the City Museum), and El Templete, a small neoclassical chapel built in 1828 to mark the spot where the first Mass was celebrated in Havana.
The square hosts a daily second-hand book market — stalls of old books, revolutionary pamphlets, old magazines, and curios that attract locals and tourists alike and give the square a pleasant, unhurried atmosphere. The Museo de la Ciudad in the Palacio de los Capitanes Generales is worth entering for the colonial-era rooms and the collection of objects relating to Havana's history.