One of Havana’s grandest pieces of architecture, the Capitolio is an important landmark and one of Centro Habana’s major touristic sights. It was designed to resemble the US Capitol in Washington DC, and the similarity is obvious. A monumental stone stairway leads to the vast domed hall, from where tours will take visitors beyond the doors to elaborately decorated chambers that once housed the seat of Cuban Congress. Directly beneath the dome lies an imitation 24-carat diamond set into the marble floor, from where all highway distances between Havana and all sites in Cuba are measured. Nowadays, It houses the Cuban Inter paliamentary Union.