500 years

     Twilight was bored. She had been walking down the hallway for what seemed like over more than hour. She would have teleported, but she had no idea where the end was and she did NOT want to teleport inside of a wall. She thought to herself, " perhaps I can teleport other ponies to ME!". Concentrating, she suddenly found all her friends next to her.

     "HEY! Whats going on!" Rainbowdash yelled.

     "Don't be rude!" said AppleJack.

     both started to argue

     " Later guys, I brought you here to have you explore this secret passage." Twilight said.

     but they continued arguing.

     "um, Twilight, its awfully dark down here. and, scary." Fluttershy whispered.

     "Its dark and dank and really really scary, who knows what monsters hide down here?" Pinkie Pie sang.

     "your not helping!" fluttershy murmured.

     "Don't worry Darling," Rarity said, wrapping a scarf around Fluttershy, " Theres nothing down here but us"

     Twilight eventually separated Rainbowdash and AppleJack and explained what was going on.

     "Secret passage, Cool!" Rainbow exclaimed.

     "Lead the way Twi."

     "Well, first, if anyone doesn't want to be here, I can send them back home."

     "I am!" Rainbowdash and AppleJack said at the same time.

     "Okie Dokie Lokie!" said Pinkie Pie

     "I'll go wherever Fluttershy goes" said Rarity

     "I can go, I guess" said Fluttershy

     "Great! lets go!" and the six were on their way.

     The first door and puzzle were easy.

     "What is the longest word ever?"

     "Smiles! because there's a mile in-between each s!"exclaimed Pinkie Pie.

     As soon as she said it, the door opened, and they went on. The tunnel never changed, it only went straight.

     "What do you think is down here anyway that needs to be guarded so much?" Rainbow said after the twenty-first door and riddle. Twilight had found out that there was a mile walk in-between each door, and she could see that every pony was getting exhausted.

     "Let's rest here for a while, I think its become night." said Twilight, and every pony gratefully lay down, and slept. None slept well,though and were anxious to continue the next morning. After much travel, and many more doors, they reached the fiftieth door. it was very large and spectacular, decorated with curling flowers, identified by Twilight as lavender, but instead of a riddle there was:

     " Welcome, Celestia."

     The door opened and the six ponies gasped in awe.