Start your week-long trip to Naples by exploring the historic center, a UNESCO World Heritage Site. Visit the iconic Piazza del Plebiscito, home to the Royal Palace and the San Carlo Theater. Wander through the narrow streets of Spaccanapoli, lined with colorful buildings and bustling markets. Don't miss the opportunity to visit the Naples Underground, a fascinating network of tunnels and caves that date back to the Greek and Roman times. End your day by indulging in some authentic Neapolitan pizza at one of the city's renowned pizzerias.