What: 1-day Travelcard (zones 1-2), London
Cost: £6.60, or $13.53
VERSUS
What: 1-day Fun Pass, New York City
Cost: $7
Bottom line: Taking the Tube will cost you about twice as much as riding the subway in New York, but it's still one of the cheapest and easiest ways to get around London - even Mayor Ken Livingstone has been known to ride it.
More information: Transport for London, 44-020-7222/1234
Metropolitan Transportation Authority, 718-330/1234
www.tfl.gov.uk
www.mta.info
