One of the four largest squares in Havana's old urban area is also the oldest square built by the Spanish colonists. The construction of churches and government public buildings around the square is also a common practice in the colonial cities when Spain colonized the Americas. At present, the main attractions around the square are the Royal Power Castle on the Northeast side, the first fortress of Havana; the chapel on the East side, which was built to commemorate the construction of Havana and the first mass for Spanish landings. The kapok trees near the chapel are regarded as divine trees, but now they are planted later; and the building on the west side was once the seat of the Governor's office in old age. The front floor tiles are made of narrow wooden strips, which are very distinctive. In the center of the square is a garden with a statue of the father of Cuba.