Chesterton is bang on target with that quote !
There is always something new to see... even if you visit the same place (like I have been... for a couple of years now :P).
Travelling alone is never fun, but seeing new things or recognizing things seen before is a cerebral exercise to make it slightly more interesting. Of course, seeing new things never ceases... as you can see from this collection - my favorite thing to do, specially on day flights :)
Picasaweb link: Up In The Air