Temple of Mithras

Six decades after this Roman-era temple was unearthed under the streets of London—and then put on display atop a parking structure—it’s back in its original home 23 ft. below what is now 12 Walbrook. That building is the European headquarters for Bloomberg, which led the relocation and helped turn the temple into an immersive exhibit, replete with sculptural light effects, sounds of Roman voices and shuffling feet, and a display of more than 600 archaeological artifacts. Admission is free, but reserving a spot is recommended. —Alejandro de la Garza