(CNN) – On any given Sunday in Harlem, visitors might be surprised to see who is attending black churches.

Tourists are lining up to worship in Harlem, where black churches are becoming big, inspirational attractions for white European travelers.

It's a growing trend, and a cultural experience that's uniquely American. CNN's Jason Carroll reports.

Read more from CNN's In America Blog

Soledad O'Brien's documentary "Who is Black in America?" airs at 8 p.m. ET/PT on December 9 on CNN.