The top 10 most-visited attractions in the country were all in the capital, according to figures.
UK visitor attractions saw a 3.2% rise in in 2015, with the biggest increase in Scotland which had a 5.48% rise.
Edinburgh Castle was the most visited attraction in Scotland – ahead of the National Museum of Scotland for the first time in five years.
More than 65 million people visited attractions in London in 2015.
Some 6.82 million people visited the British Museum last year, up from 6.7 million the year before.
The National Gallery remained in second place with 5.9 million visitors – although it suffered an 8% drop in visitor numbers – and in third place was The Natural History Museum with 5.3 million visitors.
The Southbank Centre and Tate Modern both suffered sizable falls in their visitor numbers with 18% and 19% drops respectively.
Tate Modern’s 4.7 million visitors was the lowest for 10 years, but figures are expected to improve this year following a high profile Georgia O’Keeffe exhibition and the opening of the venue’s extension this summer.
“Tate Modern continues to be the world’s most popular gallery of modern and contemporary art,” a spokeswoman said.
“We annually attract around 4.5 to five million visitors. We achieved our highest, record-breaking year in 2014 with 5.8 million visitors, due in part to the success of Henri Matisse: The Cut-Outs.”
Temporary exhibitions were credited with giving a boost in visitors to a number of attractions including London’s Somerset House, which saw the largest increase in visitor numbers in the top 10.
It had an increase of 31% and came in eighth place with 3.2 million visitors.
The Royal Academy credited its 33% increase in visitors to its Ai Weiwei and summer exhibitions.
Meanwhile, the Victoria and Albert Museum’s visitor figures was boosted by its most visited exhibition ever, Alexander McQueen: Savage Beauty.
Audrey Hepburn: Portraits of an Icon was also a huge draw at the National Portrait Gallery.
The Library of Birmingham remained the most visited free attraction outside London.
It came in 11th place with 1.8 million visitors.
Chester Zoo, was the most visited paid for attraction in England outside London with 1.7 million visitors.
It had an 18% increase in visitors due to the opening of its Islands development, which recreates six tropical South East Asian Islands – the biggest new zoo development in Europe.
The National Museum of Scotland was the most visited museum outside of London with 1.6 million visitors.
The Scottish National Gallery of Modern Art Two had a 35% increase in visitors after hosting The Amazing World of MC Escher, while the Scottish National Gallery of Modern Art One had a 47% increase in visitors thanks to Artist Rooms: Roy Lichtenstein.