The UK's National Gallery for Modern and Contemporary Art, Tate Modern has been a dazzling microcosm of the art world since it first opened its doors in 2000 and is one of the largest of its kind in the world. A remarkable merger between the past and present, Tate Modern displays the stunning national collection of modern and contemporary art, featuring both British and international artists from 1900s to the present. Here, artwork by the likes of Matice, Warhol, Picasso, Dalí, and Pollock, sit alongside those of contemporary artists who are redefining the very meaning of art. The gallery sits amid the concrete jungle of Bankside, fitted into the former Power Station with a few nifty additions. The most obvious is the two-storey glass extension that sits atop the roof, while the original lattice brickwork and towering chimney of the heritage building have been retained. Later extensions include the Blavatnik Building, with its striking sloped facade, and the conversion of the subterranean oil tanks into a permanent showcase for the performing arts. Admission is free, however, tickets must be purchased for special exhibitions.