Vicenza is a city in the Veneto region, at the northern base of the Monte Berico, where it straddles the Bacchiglione River. It is a thriving and cosmopolitan city, with a rich history and culture, and many museums, art galleries, piazzas, villas, churches and elegant Renaissance palazzi. With the Palladian Villas of the Veneto in the surrounding area, and his renowned Teatro Olimpico (Olympic Theater), the "city of Palladio" has been listed as a UNESCO World Heritage Site since 1994. In 1996, the site was expanded to include the Palladian villas outside the core area, and accordingly renamed "City of Palladio and the Palladian Villas of the Veneto". Vicenza is also the third-largest Italian industrial centre as measured by the value of its exports, and is one of the country's wealthiest cities, in large part due to its textile and steel industries, which employ tens of thousands. Additionally, about one fifth of the country's gold and jewelry is made in Vicenza, greatly contributing to the city's economy.