How can I get to Frankenstein Castle located in Darmstadt?

Question

From Frankfurt, Germany.

Answer 1

From the official site:

The Castle is directly accessible by car by a winding road that branches off from the B 426. Public transport also brings tourists to the "Frankenstein" stop at the foot of the mountain, from where a walk of about half an hour leads to the Castle.

To get from Frankfurt Hauptbahnhof to Darmstadt Hauptbahnhof, you can take the S-Bahn, which is a short, intercity train, somewhat like the L-Train in Chicago.