The vibrant coastal city of Naples, Italy, is known as the gateway to southern Italy. It’s the third largest city in Italy, just after Rome and Milan, and sits on the country’s western coast along the Tyrrhenian Sea. The city is filled with so much history, particularly within the city’s historic center. Not to mention, it’s the birthplace of modern pizza!Popular tourist attractions include the Royal Palace of Naples and the Via San Gregorio Armeno shopping street. But that’s not all that Naples has to offer. Underground, you’ll find some mind-blowing hidden gems like the Bourbon Tunnel and the San Gennaro Catacombs.