The best way to travel by train from Barcelona to Carcassonne is to take a high-speed train from Barcelona Sants station to Narbonne, and then transfer to a regional train to Carcassonne. The journey takes approximately 4-5 hours.
It works out about 17€
depends
Andorra
There isn't one. Your best bet is, take a mainline train to Toulouse. (fairly flat country, lots of vineyards). Then a branch-line to "l'Hospitalet-pres-de-l'Andorre". Keep your eyes open for Pamiers (birth-place of composer Gabriel Faure), Foix (interesting chateau), and some rugged scenery after Foix. At l'Hospitalet you are a few miles from Andorra. Uphill all the way ! There is a rather irregular bus service; a taxi might be better.
AS Carcassonne was created in 1938.
Bello of Carcassonne died in 812.
Acfred I of Carcassonne died in 906.
Léon Carcassonne died in 1894.
Ermesinde of Carcassonne died in 1057.
Ermesinde of Carcassonne was born in 972.
The area of Carcassonne is 65.08 square kilometers.