The most integral Danube city in Bulgaria, Ruse enjoys a setting amid a rolling countryside blanketed in sunflower and wheat fields. Once an outpost of the Roman Empire, it was known as Sexaginta Prista, or Sixty Ships, for the fleet that once docked here. Today, it is more known for its colorful atmosphere and as a gateway to Romania’s fabled Transylvania region. Best explored on foot, the city features many fine examples of 19th- and 20th-century neobaroque and neorococo architecture.