- Buckingham Palace has London's oldest helipad.
- Do your favourite dessert restaurants make our top eight?
- The Underground was suggested in the 1830s.
Things to do today:
FRIEZE SCULPTURE PARK: Before the fair opens tomorrow, check out the Frieze sculpture park in Regent's Park. Free, just turn up, all day (until 8 January 2017)
MARKETING FESTIVAL: There are over 200 speakers, as well as plenty of workshops and awards at the two-day Festival of Marketing at Tobacco Dock. £795, book in advance, all day (until 6 October)
LITERATURE FESTIVAL: Hear Christopher Eccleston read the script from The Time Machine, and attend talks covering the relationship between writer HG Wells and women, as part of London Literature Festival at Southbank Centre. Various prices, just turn up/book in advance, various times (until 16 October)
KNITTING AND STITCHING: There are over 400 craft companies, daily fashion shows and workshops at The Knitting and Stitching Show at Alexandra Palace. £14.50-£42, book in advance, all day (until 9 October)
V&A ART DECO: Explore art deco exhibits of the V&A with a tailored tour around the museum. £12, book in advance, 2pm
RHODES STATUE TALK: David Starkey is among the panellists at Senate House arguing whether or not history should be rewritten in accordance with changing values and whether or not we should apologise for historical wrongs. £5, book in advance, 6pm
US ELECTION: Documentary filmmaker Michael Kirk discusses the US presidential nominees with the Chair of the American Politics Group of the UK and Washington Post's London Bureau Chief. £10, book in advance, 6.30pm
CHINA TALK: Authors Alec Ash and Rob Schmitz are using personal perspectives to discuss modern life in China. The talk at Asia House is followed by a Q&A. £5, book in advance, 6.45pm
CLASSICAL OPEN MIC: We've all thought it... rap battles lack classical music. Mozart in the Urban Jungle is a classical open mic night at The Book Club composed of five minute-long performances. You vote for the winner. £10.75, book in advance, 7pm
BEIJING PERCUSSION: Ju Percussion Group commemorate their 30th anniversary at the Barbican with a performance showcasing their traditional Asian, Western classical and contemporary drumming fusion sound. £17.50 (+booking fee), book in advance, 7.30pm