North of Canterlot, in the far marches of Equestria near the border with the Griffon tribes, there is a mountain that flies.

West of Canterlot, beyond the Galloping Mountains and a desert painted in the pastel hues of a faded rainbow, a tower sits at the edge of the world.

South of Canterlot, past the Everfree forest and the desolate badlands, a city of gardens waits to be born.

The Lost Cities Challenge! Awesome authors who have taken it upon themselves to explore other abandoned places:

- The Land of Glass and Stone, by RazgrizS57
- The City that Breathes, by Pearple Prose
- Aletheia, by Foehn
- Far Kobresia, by Baal Bunny
- Keskiyönnon, by Bradel
- Unknown Architecture, by Not_A_Hat
- The Gentle People, by Bad Horse
- The Seal of Wax and Glass, by DuncanR

Dramatic Reading by Illya Leonov: Chapter 1, Chapter 2, Chapter 3, Chapter 4.

Royal Canterlot Library interview for Lost Cities.

Eighty years after the events of The Dread Chitin, Equestria is a radically different place. The arcane science of the late Duran Thirk and the information found on the Star League library core have combined to catapult the nation's science ahead by hundreds of years.

Now, facing the possible aggression of a completely unknown alien power, Twilight Sparkle and her friends have to gather together once more, leading a crew of the best ponies they could assemble in a voyage outside their own star system. They seek to learn about their potential foe, to explore the galaxy around them, and possibly find allies and friends to stand alongside them. Who knows what they will actually find?

I, Queen Chrysalis of the Changelings, was a paragon of my kind. I was the greatest military ruler my people have ever known. I was mere months from conquering the most prosperous nation in the world.

Then a strange dragon rose from the stone, and everything changed.

I do not think of conquest any more. Now, I think of persimmons.

[AU fic where Discord decided to wreak bloody vengeance when he was first released. Heavily based on (BUT NOT CANON TO) the wonderful alarajroger's Elements of Opposition continuity. Go check that out, because it's fantastic and better than this story.]

Princess Celestia asked Twilight to do a census of her new home. Through this process she discovers certain anomalies that she finds strange as a unicorn. There seems to be something missing when it comes to the pegasi, and after much prodding, prying, some spying and begging, she finally gets them to open up. What she discovers is not only shocking (to her, at least), but revealing on pegasi subculture.

Will what she learns change the way she looks at her friends? Will her friendship with them be ruined?

Nah.

Every night, in a little stable just outside of town, an old mare lays down to sleep. And every night she has the same dream of rainbows and open sky...

When Twilight Sparkle slipped beneath the covers last night, everything had been fine. She had friends whom she loved, a teacher she adored, and a bright future ahead of her. But when she woke up, her blankets and quilts had been replaced by hospital gowns and padded restraints.

Everything is wrong and nothing makes sense; even her friends have changed. The doctors keep telling her that she is sick, that none of it was real and that it was all in her head. Yet she remembers a life far beyond the hospital walls. She couldn't have made it all up on her own. They must be lying… right?

Ask Asylum Twilight - Still updating regularly!
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TVTropes
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The Asylum 20,000 View Spectacular Stage Show!

Art:
Asylum Cover by conicer
Twilight and Twilight Smiles by dreamingnoctis
Mirror Twilight and Plague Doctor by Jaestring / BloodGoldWings
Twilight Smiles and Doctor AJ by conicer
Nurse Ratchet and Silas and What's in the mirror? by Archonix
Doctor AJ Sketch by Archonix | Colored and vectored version by ReFro82
Twilight's Asylum by Khan the Cake Lover
Smilight by HappySwitch
Twilight Waking Up by Dombrus
Fan Art by toxicdemon10
Asylum Twilight by Madness-With-Reason
Asylum Fluttershy and Asylum Ch 26 by Downburst-Backspace
Twilight and her Twin by v747
Birdgirl by sirValter

Readings and Videos:
Asylum Animated Trailer Video by formuladash
Reading by Gammarobot (SugarCubeRadio): All Chapters Here
Reading by Ender Brony: All Chapters Here
Reading by VisualPony: All Chapters Here
Reading by MelancholyIguana: All Chapters Here
Fan Trailer by Kaidan: Asylum FanFic Trailer Cuckoo's Nest

Sanctuary by Kaidan
Broadhoof Files: Dr. Humors by TypewriterError
Broadhoof Files: Corporal Phalanx Spear (Ret.) by Phalanx Spear
A Hearth's Warming Tragedy by Seven Fates

A special thanks to Breath of Plagues, Rex Ivan,
ChudoJogurt, Cynewulf, Death the Kid, Selbi, PrinceDolph, Blahman2816, Queue, and Gage!

Axan Zenith - Dr. Dreamer
Dratini4 - Way Finder
psychicscubadiver - Bright Mind
Velkaden - Dream Chaser
Reese - Silver Glow
Viola Heartstrings - Clover
Archonix - Spinney Whiteacre

Early one morning, Twilight Sparkle gets up to make some tea.

Sometimes, a cup of tea is just a cup of tea. This is not one of those times.

What started as a normal friendly visit ends up taking two ponies on a trip down memory lane that leads them both to realize their friendship began even before Rainbow Dash's first sonic rainboom.

Princess Celestia tires of constantly being surrounded by decorum, deference, and formality, and decides to take a day off from being Princess. But visiting Ponyville incognito is harder than she expects. Will she be able to fit in and make friends without blowing her cover?

Fluttershy has tea with Jesus and absolutely nothing objectionable happens.