The final resting place of the cup of Christ is the ‘holy grail’ of religious tourism. But hundreds of sites claiming to be home to it, who’s right? And is it real?

Historians claim Holy Grail is in church in Leon, northern Spain. HISTORIANS say they have discovered what Monty Python could not — the Holy Grail, the cup Jesus drank from — in a Spanish church.

For Leon, along with Holy Wars co-creator—and former Sad Robot bandmate—Nicolas Perez, who both also compose for TV and film, and drummer Greg Garman, the past year has been a reflective one.

Local curators were forced to close a display after two historians claimed in a new book that a precious goblet in Spain is actually Jesus’ mythical vessel. Two art historians say Egyptian ...