a chain of islands. The plants and animals found on the ridge are unique because they evolved on the chain of islands, which is why the most rare plants and animals can be found in this area. The Pine Ridge is home to several endangered animals including the gopher tortoise, eastern indigo snake, gopher frogs, and the Florida mouse. Conservation efforts for the pine trail by Bok Tower Gardens include restoration of native plants, the regulation of invasive species and educating the public. Visitor Center Originally built in 1997, Bok Tower Gardens' Visitor Center completed a $1.8 million expansion in 2019. The Ting Tsung and Wei Fong Chao Exhibit Hall houses a redesigned exhibition showcasing the landmark's history, architecture, and surrounding wildlife and ecology. The information desk, an informative orientation film, a local art exhibit space, and the administrative offices are located in the Visitor Center. In separate buildings attached to the Visitor Center by covered walkways and a promenade are the Tower & Garden Gift Shop and the Blue Palmetto Café. Library and archives The Singing Tower houses collections that document the history and growth of the gardens and its buildings, along with Pinewood Estate. While the collections are closed to the public, selections from the archives are displayed in the Visitor Center. Anton Brees Carillon Library The Anton Brees Carillon Library was established in 1968 following the death of Anton Brees, the first carillonneur of the Singing Tower. The library is on the fifth floor of the tower. Its holdings are considered to be one of the largest collections of carillon-related materials in the world. The collection includes more than 1,500 books, 200 scores for keyboard instruments, 3,000 scores and musical compositions for carillon, 1,600 audio and video recordings, and 15 international professional journals that include more than 900 individual volumes. The library also houses vertical files on international carillons, that include newspaper clippings, biographical information and concert programs. The holdings include the original blueprints and plans for the Singing Tower and gardens, and thousands of photographs and slides. Collections include The Guild of Carillonneurs in North America Archives, Ronald Barnes Collection, Anton Brees Collection, Sidney Giles Collection and Arthur Bigelow Collection. Chao Research Center Archives The Chao Research Center Archives holds the official papers of Bok Tower Gardens, along with related collections. It occupies the second floor of the Singing Tower, and was created through a donation