Yes. There is a train that runs from Interlaken to Grindelwald and it takes less than an hour.
Grindelwald is a place in the same district of Switzerland as the capital city, which is Bern. So Grindelwald is not a capital city.
Bern, Chur, Grindelwald, Brig, Basel, Geneva, Winterthur, Zurich, Thun and Neuchatel. They are all famous cities of Switzerland.
The population of Grindelwald is 0,576.
If you are referring to the Eiger mountain, this can be found in the Bernese Alps in Switzerland.
Grindelwald built the prison known as Nurmengard to house his enemies and those who opposed his ideology of wizarding supremacy. It was located in the mountains of Austria and housed dangerous magical creatures and imprisoned witches and wizards during his reign of terror.
In 1945, he defeated Gellert Grindelwald.
The cast of The Flasher from Grindelwald - 2000 includes: Martin Guggisberg as The Flasher
Nobody built the Matterhorn. It is a mountain. It was built by geological forces which pushed up the Alps.
Voldemort.
He dies 
You're supposed to infer that there was something more than a friendship between dumbledore and grindelwald, but dumbledore has to destroy grindelwald because he is evil.