In London, Tate Modern's new extension, a 10-storey, twisting pyramid-shaped tower, has been unveiled. Switch House, built at a cost of £260m ($367m), contains three new gallery levels, allowing 60% more artworks from the Tate collection to go on show.

Frances Morris, Tate Modern's new director, said the new extension allows the gallery to show more international art and more art by women. "There was a huge deficit in our collecting prior to 2000," she said. "When we opened, 17% of the art on display was by women. Now 50% of the solo rooms are works by women such as Phyllida Barlow and Louise Bourgeois."

Tate Modern Switch House extension
Switch House, Tate Modern's new pyramid-shaped extensionStefan Wermuth/Reuters
Tate Modern Switch House extension
A concrete spiral staircase inside the new extensionJack Taylor/Getty Images
Tate Modern Switch House extension
People walk through one of the vast spaces inside Tate Modern's new Switch HouseJack Taylor/Getty
Tate Modern Switch House extension
People sit in one of the rooms at Tate Modern's new Switch HouseJack Taylor/Getty
Tate Modern Switch House extension
A tree by Ai Weiwei stands on the bridge connecting the Turbine Hall and the Switch HouseStefan Wermuth/Reuters
Tate Modern Switch House extension
People look at a tree by Ai WeiweiStefan Wermuth/Reuters
Tate Modern Switch House extension
A museum assistant poses with Spider by Louise BourgeoisStefan Wermuth/Reuters
Tate Modern Switch House extension
Spider I by Louise BourgeoisStefan Wermuth/Reuters
Tate Modern Switch House extension
A museum assistant poses with Yellow versus Purple by Olafur EliassonStefan Wermuth/Reuters
Tate Modern Switch House extension
A museum assistant poses with Mirror and glass by Yayoi KusamaStefan Wermuth/Reuters
Tate Modern Switch House extension
A Tate employee walks past the artwork Stack, 1975 by Tony CraggDaniel Leal-Olivas/AFP
Tate Modern Switch House extension
A visitor views at Untitled (Ghardaia), a sculpture made from cous cous by Kader AttiaJack Taylor/Getty Images
Tate Modern Switch House extension
A Tate employee walks across Beirut Caoutchouc 2004-2008 by Marwan RechmaouiDaniel Leal-Olivas/AFP
Tate Modern Switch House extension
A museum assistant poses with Pavilion Suspended in a Room I by Cristina IglesiasStefan Wermuth/Reuters
Tate Modern Switch House extension
A museum assistant poses with Babel by Cildo MeirelesStefan Wermuth/Reuters
Tate Modern Switch House extension
An artist performs live art alongside Untitled by Donald JuddJack Taylor/Getty
Tate Modern Switch House extension
A man walks through one of the spaces in the Switch HouseStefan Wermuth/Reuters
Tate Modern Switch House extension
The interior of the new restaurant on Level 9 of the Switch HouseDan Kitwood/Getty/Tate Catering
Tate Modern Switch House extension
A waitress sets a table in the restaurant on Level 9Dan Kitwood/Getty/Tate Catering
Tate Modern Switch House extension
A Tate employee looks out from the 10th floor viewing platformJack Taylor/Getty Images
Tate Modern Switch House extension
Visitors take pictures of the London skyline from the 10th floor viewing platformJack Taylor/Getty Images
Tate Modern Switch House extension
The view from the new restaurant on Level 9 of the Switch HouseDan Kitwood/Getty/Tate Catering
Tate Modern Switch House extension
Tate Modern's Turbine Hall and the new Switch HouseJack Taylor/Getty

The top floor of the new Switch House is an open-air viewing terrace, which will offer visitors spectacular 360-degree views of the London skyline when it opens to the public on Friday 17 June 2016.