Rome has opened two subway stations. One is deep beneath the Colosseum that mixes the modernity of high-tech transport with artifacts from an ancient era. Commuters and tourists who entered the station on Tuesday beside the iconic amphitheater can view displays of ceramic vases and plates, stone wells and suspended buckets. They can also see the ruins of a cold plunge pool and thermal bath from a first-century dwelling. Screens show the excavation process serving both to delight archaeology enthusiasts and justify why it has taken so long to open.