The Muslim City of Lisbon

Every year on Fat Tuesday, dozens of people line up in Praça de Espanha on the periphery of central Lisbon, waiting for one of the infrequent buses heading to Sesimbra.

On that day, the small coastal town comes alive with a Carnaval parade complete with floats, drummers, exotic dancers in dazzling costumes and all the pre-Lenten debauchery it can pack into one afternoon.

In Lisbon, revellers line up for the bus in anticipation of experiencing that most Catholic of festivals. But while they wait, a glance to the other side of the square reveals something that…