Travelers - what is the most unique, unforgettable place you have ever been to?

For more details - I haven’t had too much time to travel yet outside the US but while I have seen a lot of the basics - Paris, London, Barcelona, Athens, Santorini, Mykonos, Madrid…

While they have all been great - for my next trip I want to a place that feels different so would love to hear a place that someone who has been to have a lot of places would recommend as unforgettable