Three London Shows Put a New Spin on Old Classics

When I was in London recently, walking down near Cheapside, north of the Thames, I went into the small museum built above the Mithraeum, an ancient site hidden twenty feet under Bloomberg’s glassy European headquarters. You’re often conscious in London of the place’s great age, but there’s nothing like visiting the remnants of a third-century temple devoted to Mithras—a bull-killing god popular with Roman centurions—to make you appreciate just how many cities lie beneath the streets. (A river, the Walbrook, once ran by the temple, though it has since been...