Panama's old quarter (or Casco Viejo, Panama) features many architectural styles, from Spanish colonial buildings to French and Antillean townhouses built during the construction of the Panama Canal. The more modern areas of the city have many high-rise buildings, which together form a very dense skyline. There are more than 110 high-rise projects under construction, with 127 already built. The city holds the 45th place in the world by high-rise buildings count.