Twenty-five years after the Good Friday peace agreement in Northern Ireland, Belfast still bears the scars of decades of sectarian violence. So-called peace walls are barriers built to keep Catholic ...

Belfast calls them “black cab tours” and they’re one of the most sought-after tourist attractions in town, equal to the museum dedicated to Belfast’s shipping industry and construction of the Titanic.

Since the Reformation, most of the countries of Europe have been split at one time or another between Catholic and Protestant. Martin Luther kicked off the divide when he posted his 95 complaints ...