10. Oslo, Norway
2018 is a great year to visit Norway's capital. Not only is Oslo celebrating 50 years of marriage between their king and queen, the city's opera house is also turning 10 years old. That means there will be plenty of cultural events, as well as performances and concerts.
Architecture buffs will love this city; Oslo has seen numerous contemporary buildings spring up in recent years.
[Photo via @ria_molde]