I didn't know much about the ancient city of Ephesus in Turkey, but once I visited there, I came away feeling awestruck. This sprawling city dates back nearly three thousand years, and once the waters of the eastern Mediterranean lapped its shores. Only ten percent of it has been excavated so far. Yet even that is impressive: Broad cobblestone-paved streets are lined with the ruins of monuments, temples, shops, and houses, many of which had indoor plumbing. An ornately-decorated library is bordered by a red-light district, and a huge amphitheater once heard the voice of St. Paul's preaching. Antony and Cleopatra honeymooned here, and St. John and Mary, the mother of Jesus, lived nearby.
Most impressive were the terrace houses, probably built in the 2nd century A.D. to house wealthy Roman merchants. I took these photos of the beautiful mosaic floors inside the houses, whose patterns are fresh and lively. Perhaps they will inspire your designs!