Last updated at 08:53

World landmarks go dark for Earth Hour

Big Ben before and after the lights go off for Earth HourAP

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.

Eiffel Tower before and after during Earth HourGetty Images

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

Frankfurt skyline before and during Earth HourGetty Images

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

The colonial aqueduct Arcos da Lapa before and during Earth Hour in Rio de Janeiro.Reuters

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

the Opera House in Oslo, Norway during and after the Earth HourEPA

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

The London Eye before Earth HourReuters

The London Eye before Earth Hour begins...

The London Eye during Earth HourReuters

The London Eye as it disappears.

Performers covered in lights dance during Earth HourGety

Performers covered in lights dance during Earth Hour.