Doctor Who is a British science fiction television program produced by the BBC. The series follows the adventures of mysterious time-travelling adventurer known only as "The Doctor", a Time Lord from the planet of Gallifrey, who explores time and space with various companions in his ship, the TARDIS.
On 23rd November this year (2013) Doctor Who celebrates its 50th Anniversary, making it the longest running science fiction television series in the world.

On 9-18-2015 the Coordinates of the final were changed, but the puzzle solution is still the same, only the applications of the symbols is different.
DO NOT go on the mountain bike only trail to find this cache. There is a trail off the main gravel road that starts at N47 28.594 W 121 56.848. It is also visible on the Northwest Trails maps linked below.

Remember to record the Gallifrey symbols found in the log book, they are needed to determine the coordinates of the bonus cache of this series. After conversion, 29 are labeled North and 29 are labeled West followed by a number. The bonus cache, The Best Idea Ever Invented, provides the instructions how to determine its coordinates.