melting pot
A place where a number of different people and cultures mix in harmony. America has traditionally been known as a great melting pot because of the diverse backgrounds and cultures of its citizens.
a melting pot
A melting pot is a place or situation where there are many different types of people, cultures or ideas, all existing together. A melting pot of cultures, this region has always been inhabited by different ethnic groups. Barcelona was a melting pot of musical influences.