10. London, United Kingdom
We are starting off our list of best cities for LGBT families with London, which is a well-known LGBT tourism destination, but in 1967, homosexual acts were treated as illegal here. In 2005, gay couples were allowed to adopt children. Eventually, same-sex marriage was allowed in 2014. The right to change legal gender, meaning amending the sex on birth certificates is also now allowed. Gay people can openly serve in the UK military service since 2000. You may want to prepare early for their Pride Festival in London starting on June 24, 2017. The parade and main events will be held on July 8, 2017.