Title: London
Content: 1) British Museum: 6,820,686 ; 2) National Gallery: 5,908,254 ; 3) Natural History Museum (South Kensington): 5,284,023 ; 4) Southbank Centre: 5,102,883 ; 5) Tate Modern: 4,712,581 ; 6) Victoria and Albert Museum (South Kensington): 3,432,325 ; 7) Science Museum: 3,356,212 ; 8) Somerset House: 3,235,104 ; 9) Tower of London: 2,785,249 ; 10) National Portrait Gallery: 2,145,486 London is one of the leading tourist destinations in the world and in 2015 was ranked as the most visited city in the world with over 65 million visits. It is also the top city in the world by visitor cross-border spending, estimated at US$20.23 billion in 2015. Tourism is one of London's prime industries, employing 700,000 full-time workers in 2016, and contributes £36 billion a year to the economy. The city accounts for 54% of all inbound visitor spending in the UK. London was the world top city destination as ranked by TripAdvisor users. In 2015 the top most-visited attractions in the UK were all in London. The top 10 most visited attractions were: (with visits per venue) The number of hotel rooms in London in 2015 stood at 138,769, and is expected to grow over the years.
Title: Tourism in London
Content: British Museum – 5.9 million visits ; Tate Modern – 5.7 million ; National Gallery – 5.2 million ; Natural History Museum, London – 4.4 million ; Victoria and Albert Museum – 3.7 million ; Science Museum, London – 3.3 million ; Southbank Centre – 3.2 million ; Somerset House – 3.2 million ; Tower of London – 2.8 million ; Royal Museums Greenwich – 2.6 million The London Eye is a giant Ferris wheel located on the edge of the River Thames. It is 135 metres tall and has a diameter of 120 metres. A short walk away, the area boasts the London Aquarium, Elizabeth Tower, the Houses of Parliament, Westminster Abbey and Nelson's Column. In 2013, the tallest building in London, the Shard, opened a viewing platform to the public. Other major tourist attractions in London include the Tower of London, Buckingham Palace (although this is only open to the public during a limited number of months in the summer), Tower Bridge Experience, Madame Tussauds, ZSL London Zoo, London Dungeon and St Paul's Cathedral. The Association of Leading Visitor Attractions indicated that the following were the Top 10 visitor attractions in 2017:
Title: Tourism in England
Content: London — largest metropolitan area in Western Europe, and a global capital of finance, fashion, art and culture. In 2019, more than half of overseas tourists visiting the UK included a trip to London. ; Manchester — The third most visited city in the UK, a cultural, sporting, entertainment, shopping and media hub. ; Birmingham — the UK's second largest city (by population) in the industrial heartland. ; Liverpool — The home of the Beatles, a cosmopolitan city famous for its vibrant nightlife, rich cultural heritage, waterfront, architecture, and music and sport. ; Brighton and Hove — regency seaside resort and university town with quirky shopping, rich culture and vibrant gay nightlife. ; Bristol — vibrant music and art scene, historic buildings, a waterfront area in the West Country's largest city. ; Oxford and Cambridge — university towns with prestigious colleges, museums, and gardens. ; Bath — UNESCO World Heritage Site city renowned for its Georgian architecture, gardens, parks, and museums. ; Leeds — cultural, financial and commercial heart of west Yorkshire The ten English cities visited most by overseas tourists in 2019 were: 
Title: Outline of London
Content: 8 Canada Square ; 30 St Mary Axe ; Canary Wharf ; Citigroup Centre, London ; London Eye ; Millennium Bridge, London ; The O2 Arena ; Millennium Dome ; One Canada Square ; The Pinnacle (London) ; The Shard ; Tower 42 ; Wembley Stadium 
Title: List of tourist attractions in the City of Westminster
Content:  The City of Westminster contains many of the most famous tourist sites in London.
Title: London, Ontario
Content:  London has a number of parks. Victoria Park in downtown London is a major centre of community events, attracting an estimated 1 million visitors per year. Other major parks include Harris Park, Gibbons Park, Fanshawe Conservation Area (Fanshawe Pioneer Village), Springbank Park, White Oaks Park and Westminster Ponds. The city also maintains a number of gardens and conservatories.
Title: List of tourist attractions in the City of Westminster
Content: Benjamin Franklin House ; Carnaby Street ; Leicester Square ; Piccadilly Circus ; Ripley's Believe it or Not! (London Pavilion) ; Regent Street ; Hamleys ; Liberty's ; Trafalgar Square ; National Gallery ; National Portrait Gallery ; Nelson's Column ; St Martin-in-the-Fields 
Title: Outline of London
Content: Barbican Estate ; Catacombs of London ; Covent Garden ; Leicester Square ; Mayfair ; Piccadilly Circus ; St Paul's Cathedral ; Tower Bridge ; Trafalgar Square ; World Heritage Sites ; Tower of London ; Kew Gardens ; Maritime Greenwich ; Royal Observatory, Greenwich ; Westminster site ; Palace of Westminster ; Westminster Abbey ; Saint Margaret's Church 
Title: City of London
Content:  25 wards, with administration at the historic Guildhall. Other historic sites include St Paul's Cathedral, Royal Exchange, Mansion House, Old Bailey, and Smithfield Market. Although not within the city, the adjacent Tower of London is part of its old defensive perimeter. Bridges under the jurisdiction of the City include London Bridge and Blackfriars Bridge. The city is a major business and financial centre, and the Bank of England is headquartered in the city. Throughout the 19th century, the city was the world's primary business centre, and it continues to be a major meeting point for businesses. London came top in the Worldwide Centres of Commerce Index, published in 2008. The insurance industry is located in the eastern side 
Title: London
Content:  after Istanbul's and Moscow's, with 14,040,163 inhabitants in 2016. London has four World Heritage Sites: the Tower of London; Kew Gardens; the Palace of Westminster, along with Westminster Abbey, and St Margaret's Church; and the historic settlement in Greenwich, where the Royal Observatory, Greenwich defines the Prime Meridian (0° longitude) and Greenwich Mean Time. Other landmarks include Buckingham Palace, the London Eye, Piccadilly Circus, St Paul's Cathedral, Tower Bridge and Trafalgar Square. It has numerous museums, galleries, libraries and sporting venues, including the British Museum, National Gallery, Natural History Museum, Tate Modern, British Library and West End theatres. The London Underground is the oldest rapid transit system in the world.

Question: what to visit in london city?
Answer: Regent's Park.