Tate Modern, one of London's most impressive attractions, is an unmissable gallery of modern and contemporary art housed in the revitalized Bankside Power Station. This iconic combination of modern art and industrial architecture has made the gallery a resounding success, welcoming both the public to its free permanent collection and visitors to its larger-scale, ticketed temporary exhibitions. The main building, known as the Natalie Bell Building in honor of a local activist, was once the power station's boiler room and today houses the 3300 sq. m. Turbine Hall, which serves as a mecca for large-scale installations and temporary exhibitions. The Turbine Hall's annual commission creates art made accessible to the public, including Kara Walker's Fons Americanus, a 13 meter-tall working fountain, Superflex's playground of three-person swings, and Abraham Cruzvillegas' Empty Lot, a maze of gardens watered with soil collected from parks around London. The permanent collection, which spans over sixty thousand works, features pieces by Georges Braque, Henri Matisse, Piet Mondrian, Andy Warhol, Mark Rothko, Jackson Pollock, Joseph Beuys, Magdalena Abakanowicz, Ai Weiwei, Rebecca Horn, and Zanele Muholi. It is divided into themes and chronology and can be seen on levels 2 and 4 of the Natalie Bell Building and levels 0, 3, and 4 of the Blavatnik Building. The Start Display, located on level 2 of the Natalie Bell Building, is the ideal starting point for those seeking an introduction to modern art. The impressive Natalie Bell Building, which is composed of 4.2 million bricks and reaches 200 m in length, was designed by Swiss architects Herzog and de Meuron, recipients of the 2001 Pritzker Architecture Prize for their transformation of the old power station. It features the 99 m-high chimney, a two-story glass box on the roof, and the Turbine Hall. The 10-story Blavatnik Building extension was also designed by Herzog and de Meuron. Don't miss the outstanding views of the city from the 10th-floor Viewing Level of the Blavatnik Building!