London

Eight million objects across 69 galleries — the Rosetta Stone, the Elgin Marbles, the Lewis Chessmen, the Egyptian mummy collection. The Great Court (Norman Foster's 2000 glass roof) is the largest covered public square in Europe. The most complete single humanities education available for free in any building on Earth.

The White Tower (1078 AD, the oldest Norman keep in England), the Crown Jewels (Koh-i-Noor included — a specific historical point for Indian visitors), the Yeoman Warder tour, and the site of two queens' executions. Tower Bridge (1894) raises for ships and gives the most reproduced single London photograph from the northern approach at 7am first light.

Westminster Abbey (39 monarchs crowned here, Poets' Corner with Chaucer, Dickens, Darwin, and Newton within 50m), the Houses of Parliament (the most photographed river facade in Europe), and the Changing of the Guard at Buckingham Palace (11 am, specific days — check royal.uk before visiting).

Leonardo's Virgin of the Rocks, Vermeer's Young Woman Standing at a Virginal, Van Gogh's Sunflowers, Monet's Water Lilies, Seurat's Bathers, Velázquez's Rokeby Venus — the most complete single free painting collection in the world. Trafalgar Square below with Nelson's Column is London's most public gathering space.

The Tate Modern's Turbine Hall (152m long, 35m high, free rotating annual commission) gives the most dramatically scaled contemporary art installation in the UK. Borough Market (10 minutes walk, Thursday–Saturday) has operated on the same Southwark site since 1014 AD — the finest single food market in Europe.

Christopher Wren's 1710 masterpiece — the Whispering Gallery (a whisper travels 34m across the dome's inner wall), the Golden Gallery at 85m (528 steps, the most complete City panorama), and the Crypt (Wellington and Nelson both buried here). The City of London's Roman walls (3rd century, 6 visible street-level fragments) give the deepest historical layer.

The Royal Observatory (longitude 0°, the specific point from which all world time is measured), the Cutty Sark (last surviving Victorian tea clipper, 1869), the National Maritime Museum (world's largest maritime museum, free), and the Queen's House (Inigo Jones, 1635, the first Palladian building in England). Accessible by Thames Clipper in 25 minutes from central London.

The pastel-coloured houses of Pembridge and Ledbury Roads give London's most photogenic residential streets. The Saturday Portobello Road antique market (the covered section under the Westway, 9 am–1 pm) offers the most complete single-day antiques circuit in London. Notting Hill Carnival (August Bank Holiday) is the largest street festival in Europe — 1 million participants.

Three world-class museums within 500m of each other — the Natural History Museum (the Hintze Hall dinosaur skeleton, the Blue Zone minerals, free), the Science Museum (Apollo 10 command module, Babbage's Difference Engine, free), and the Victoria & Albert (world's finest decorative arts collection, the Cast Courts with Michelangelo's David at original scale, free). Hyde Park's 251 hectares are adjacent.

The Bombay-style Irani café format (of which fewer than 10 survive in Mumbai itself) across 5 London locations — the 24-hour black dal, the bacon naan roll, the house chai. A meal at Dishoom consistently gives Indian visitors a Bombay café experience that is more historically faithful to 1960s Irani culture than to contemporary Mumbai.