1. Exhibitions Between 1640 and 1666, ­someone stashed hundreds of Elizabethan and Jacobean jewels beneath a cellar floor in London’s Cheapside neighborhood, but never returned to reclaim them. Now through April 27, the Museum of London’s eagerly anticipated new exhibition, “The Cheapside Hoard: London’s Lost Jewels,” invites jewel lovers, historians, and curiosity-seekers to ogle the full collection for the first time since its accidental discovery in 1912. Scholars hope the 500 ­jewels, gems, and artifacts—­including ­Byzantine cameos, bejeweled bottles, even a custom fragra