Declared a World Heritage Site by UNESCO in 1998, Trinidad was founded in 1514 by Diego Velazquez. For over 200 years, the city was very wealthy and a major trading centre for slaves and sugar. The impressive colonial buildings around the main square belonged to the wealthy land-owners and the cobblestone streets and architecture all date back to its sumptuous past. From the 1850s or so, Trinidad become more isolated and while the wealth disappeared, it served to protect the city from any radical new building and the original town layout has been left largely unchanged. The town centre has recently been masterfully restored, down to details like the street lighting.