Big Ben before and after the lights go off for Earth Hour
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World landmarks go dark for Earth Hour

29 March 2015 Last updated at 12:48 BST

Famous landmarks around the world have been switching off their lights as part of Earth Hour.

The annual event organised by the World Wildlife Fund aims to raise awareness over the way we create and use energy.

Image copyright Getty Images

Yesterday at 8:30pm, people around the world in seven thousand cities and towns joined in, including Paris' Eiffel Tower.

Image copyright Getty Images

It was lights out for skyscrapers on the Frankfurt skyline, to highlight awareness about saving energy.

Image copyright Reuters

The famous colonial aqueduct Arcos da Lapa. WWF said that Earth Hour 2015 was the biggest one to date.

Image copyright EPA

The Opera House in Oslo as 1200 monuments' lights, in 170 countries, are switched off.

Image copyright Reuters

The London Eye before Earth Hour begins...

Image copyright Reuters

The London Eye as it disappears.

Image copyright Gety

Performers covered in lights dance during Earth Hour.