Following on from the very popular Trans-Siberian PP Event, we are preparing the ground for our next Event which is going to be epic

To whet your appetites, I'm going to post some pictures that relate to destinations on the route...
but I'm not going to give the Event's theme away for a little while 
Feel free to comment with any thoughts you might have about what it could possibly be - we won't be confirming or denying any suggestions though

HINT NUMBER ONE:-
Picture (C) chensiyuan on Wikipedia