A house in Boston is on its way to becoming an historic landmark after the current owner uncovered something unusual.

From the cellars, a grand underground hallway leads outside to the Peristyle (Split's main square) and Diocletian's vestibule, the dramatically domed entryway to the emperor's private rooms.

Plus, Split sits on the cleanest water for swimming ... city, and coastline. The vestibule that once marked the entrance to the imperial apartments is there. The dome is long gone, but the ...