My dream is to travel the world... on horseback. I can imagine going all the way to the south of South America, take a ship over to South Africa, riding all the way up to the far reaches of Scotland... In Iceland, I'd have to borrow a horse as foreign animals are not permitted there...

(_image from Wikipedia article about this breed of horse.)
Sail to Norway and ride up and down Scandinavia until I was done with Finland and continue across Russia... I can't imagine a more awesome journey. It would take years to accomplish, but could only be done with time and money... which I do not have, so it remains a dream.