Tulsa is still reaping the benefits of rapid economic growth that began in the early 20th century. On June 25, 1901, when drillers struck oil in Tulsa, the city's growth and development increased significantly. Oil tycoons were quickly drawn to Tulsa to take part in the wealth. The city has continued to progress and today it is Oklahoma's second largest city. Tulsa has earned the nickname Green Country due to the large number of parks and gardens in the area, including the Tulsa Garden Center, where a number of garden types and an arboretum are found. One of Oklahoma's finest museums is Tulsa's Gilcrease Museum, which displays more than 10,000 American West artworks dating from colonial times to the present, as well as an archival and anthropological collection. The Philbrook Museum of Art is an Italian-Renaissance villa that is surrounded by gardens and holds a varied collection of artworks within.