4. Hamburg, Germany
Hamburg's new 790 million euro Elbphilharmonie concert hall is reason enough to visit this northern Germany city in 2018. The hall took years to complete, but its striking glass walls and contrasting brick bottom are a sight to behold.
The hall is conveniently located the in HafenCity port area, which stretches along the Elbe River and is home to riverfront bars, bustling nightlife, and much more.
[Photo via @cat_gericke]