Describir: Bridges and how they are built /

__    __    _____     ____       ___      ______     ___      _  _     _____   
\ \\ / //  |  ___||  |  _ \\    / _ \\   /_   _//   / _ \\   | \| ||  |  ___|| 
 \ \/ //   | ||__    | |_| ||  | / \ ||    | ||    | / \ ||  |  ' ||  | ||__   
  \  //    | ||__    | .  //   | \_/ ||   _| ||    | \_/ ||  | .  ||  | ||__   
   \//     |_____||  |_|\_\\    \___//   /__//      \___//   |_|\_||  |_____|| 
    `      `-----`   `-` --`    `---`    `--`       `---`    `-` -`   `-----`