The cache is not at posted coordination.
This cache is an introduction and practice for hunters to know more about cryptography.
Cryptography is constructing and analyzing protocols that prevent third parties or the public from reading private messages (definition from wiki). When hunters played geocaching, we sometimes faced this kind of difficult mystery. This kind of knowledge was unfamiliar to people at Taiwan. So let’s try to learn some basic and classic cryptography. Two classic kinds of cryptography are transposition cipher and substitution cipher. Transposition cipher means rearranging the order of letters in message. Substitution cipher means systematically replacing the letters. There are more complex forms of cryptography in the modern era, like morse code. With cryptography, we could communicate in secret. Inspired by some awesome caches that decoding message with substitution cipher game at Taiwan. Interesting that substitution cipher seems to be more popular at Taiwan. This time, let me create this cache and “transposition” some messages from ancient myth and tales in Greece.
Athena is the god of wisdom and war in myth and tales in Greece. Did you know how Athena was born? Athena was actually born by her father instead of her mother. How did it be happened?
Here is the message from Athena.
“I gave you 3 treasures to know IEECAZUHAAHMSDE in this rail fence.”
Stage 1 Born

You can validate your puzzle solution with certitude.
Stage 2 City and wall

You can validate your puzzle solution with certitude.
Final Stage

You can validate your puzzle solution with certitude.
Basic principle :
1. ALL the answers should be type in English without space.
2. You could solve the mystery at home to obtain the coordination except the third certitude.
3. All hints information were included in Athena's announcement in each stage. If you faced problem, try google the cryptography-related key word. Or message the CO.
4. Enjoy the tiny city trail. Hope you like it.
5. Do not picture at the final point or the log will be deleted without informing.
If you are interesting to more this kind of caches at Taiwan.
Try GC7BX13, morse code type.
Try GC609N7, pIqaD type
Try GC70DDX, Sign language single substitution type
Try GC772QD, kind of polyalphabetic cipher type
Try GC7GC3R, tough and multiple one.
Welcome to introduce more fascinating cryptography cache.