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Europe! Wow, when are you going and for how long? Our list would depend on the season. Yet, we still made a list of places. We have many suggested cities like: London, Paris, Amsterdam, Berlin, Prague, Vienna, Budapest, Rome (and maybe a few other towns in Italy - lots to see and eat there!), Barcelona and Lisbon. There's actually so much more, take a flight on the way there or back from America via Iceland. Slightly expensive country, but very beautiful!
Ah! There is also Dublin and Edinburgh as great cities to visit.
Luckily, in Europe, its quite easy to move around - cheap flights if you can get them early and off-peak as well as look up at inter-railing around Europe. We will do a post in the future about our inter-railing trip last year.

This is super helpful, thank you soo much. These places are incredible recommendations, and they are now on my travel list!
I am not quite sure for how long, but I am thinking of Italy first.
I am also really into oceans and cliffs.. I would love to go somewhere that has most beautiful cliffs or something. Ill be waiting for your future post about your inter-railing trip! Again, thank you for the feedback, it is much appreciated.