World Currency - The theme of these currencies is influenced by man's architectural achievements. The 10 Contin depicts the Vasco da Gama Bridge (Portugal), known as the longest bridge in Europe. The 20 Contin reflects The Gateway Arch (ST. Louis Arch) in the United States, also known as the Gateway to the West. The 50 Contin represents Burj Dubai ("Dubai Tower") is a super tall skyscraper under construction in Dubai, and is the tallest man made structure ever built