Candlekeep

This many-towered fortress stands on a slender volcanic crag 100 feet off the coast. Candlekeep preserves a huge library of Faerûnian lore, learning, and prophecy. 
The keep’s central tower is surrounded by beautiful grounds. A ring of buildings runs along the inside of the massive outer walls. The structures include guest houses, stables, granaries, a warehouse, an infirmary, a temple to Oghma, and shrines to Gond and Milil.
The keep is ruled by the Keeper of the Tomes and First Reader, who are assisted by several Great Readers, many scribes, and numerous apprentices. Visitors who bring a tome as their entry fee are allowed to stay for up to a tenday, during which time they can conduct research and have rare books copied (for a steep price).
To enter the great library of Candlekeep, one must furnish the library's monks with a book not already contained in the library's archives. Travelers on the way to Candlekeep often stop in Baldur's Gate, anticipating that they can find such a book in the city's markets. As such, Baldur's Gate does a small but bustling trade in rare books. Several merchants have a known policy of buying valuable books without question, selling them at a high markup. Travelers seeking a specific book also hire mercenaries or adventurers to venture into dungeons or ruins and bring back the prize.
If information can't be found in the whisper-markets of Baldur's Gate , then Candlekeep becomes a logical next stop. Adventurers are sometimes hired to guard a desperate traveler on the road south, or to guard the outrageously rare tomes scholars might carry to gain admission. The Guild knows the signs of a traveler headed for Candlekeep, and often dispatches robbers to steal books and resell them to the merchants of the city.