Chur ist not the big centre, but the best starting point:
You can easily reach Zurich Airport, St. Moritz, Davos, Flims/Laax, or even visit Italy, Austria, and Germany (Lake Constance and Lake Zurich are about an hour away).

http://en.wikipedia.org/wiki/Chur
http://www. churtoursimus.ch

Chur (pronounced /koor/) is the capital of the Graubünden canton, and is also the oldest continuously settled city in Switzerland. Originally it was believed that the history of the city went back approximately 5,000 years – ‘Chur’ comes from the Celtic word kora or koria (clan, tribe). However, recently a landlord who was building an underground garage in the neighborhood below the cathedral got the surprise of his life when they discovered archeological remains that dated back approximately 13,000 years.
In Roman times, as well as more recently, Chur was an important outpost along the north-south trade routes. Although many parts of the original Roman city wall are now gone, there are still remnants around the old city center, as well as a couple of the gate towers. Much of the old town has buildings dating from 1464 to the mid 1500’s.

Language
Reflecting its history, the city is trilingual, speaking a mix of German, Italian, and Romansh (a Latin derivative).
Here are some words in Romansh - easy to learn for you:

curiosity = MIRVEGLIAS
gift = REGAL
Loveaffair = AFFERA D'AMUR

Who is who in Graubünden
Even Graubünden generate a Group of famos People ( Artist Giacometti, Segantini, womans right Hortenisa v. Salis, architect Peter Zumthor, Hela Tscharner, Gion Camidada, Robert Maillart, H.J Giger (IT) ..)
the world most famos Grison-Girl AND Boy are
"HEIDI " and the "SCHELLEN-URSLI"

https://en.wikipedia.org/wiki/Grisons

Geography
The city sits in a gorgeous glacial valley where the Plessur and Rhine rivers meet. Warmed by the föhn southern winds, Chur has the HIGHEST mean temperature in Switzerland. It also has its own summer/winter recreation area served directly by cable car from the town center – the Hausberg Brambrüesch rises to 2,176 meters above the town.

Approximately 90 minutes from Zürich, Chur sits at the gateway to Graubünden – home of the most famous skiing resort towns in Switzerland. Additionally, the Bernina and Glacier Express trains depart from Chur’s train station, as does the Bernina PostBus.