General fact: 208 is the heaviest stable isotope of any element (lead).
Mathematical fact: 208 is the sum of the squares of the first five primes.
Trivia: 208 is the area code for the US state of Idaho.
Historical date: July 26th is the day in 1533 that Atahualpa, the 13th and last emperor of the Incas, dies by strangulation at the hands of Francisco Pizarro's Spanish conquistadors.