Where best to be every hour of the day to catch the planet's top sights and experiences - even if you'll need a teletransporter to make it happen.
12 midnight: Kilimanjaro, Tanzania
Steel yourself: this is the time to start your gruelling summit attempt on the 5,895m mountain. With any luck youʼll be up there by sunrise...
1am: New York, USA
Head up the Empire State Building. Its observation deck is open until 2am – the ultimate place to survey the city that never sleeps.
2am: Lausanne, Switzerland
Listen for the last cry of the nightwatchman – since 1405 a guardian has called from the Cathedral's belfry every hour, on the hour, from 10pm to 2am: 'C'est le guet; il a sonné lʼheure' ('This is the nightwatch; the hour has struck').
3am: London, England
Join the early-rising meat traders of 140-year-old Smithfield Market – though youʼll have to wait until 6am for the nearby Hope pub to open.
4am: Toronto, Canada
Grab an early breakfast at Fran's. This atmospheric diner has been serving favourites such as prize-winning pancakes and baby rack ribs 24 hours a day since 1940.
5am: Atacama Desert, Chile
Wrap up warm for the El Tatio Geysers. These high-altitude geothermal gurglings are most spectacular at sunrise, when their steam condenses in the cold air.
6am: Mumbai, India
7am: Sydney, Australia
Well, 6.55am to be precise: the time when behind-the-smelly-scenes auction-action tours of Sydney Fish Market begin. Mon, Thurs, Fri.
8am: Mexico City, Mexico
Prepare for the pomp and parading that accompanies the daily flag-raising in the capital's super-sized Zócalo square.
9am: Paris, France
Get to the Louvre – perhaps the worldʼs biggest, bestest repository of art – as soon as the doors open, to make the most of your day. Closed Tues.
10am: Abu Dhabi, UAE
Join a free guided tour to better appreciate the elegant Sheikh Zayid Grand Mosque, one of the largest in the world.
11am: Athens, Greece
Line Syntagma Square to watch the Changing of the Guards at the Tomb of the Unknown Soldier. The pompom-slippered soldiers change every hour, on the hour, though Sundays at 11am are the main event.
12 noon: Santiago de Compostela, Spain
Walk into the colossal cathedral – the goal for every peregrino making the epic Camino de Santiago pilgrimage – for the special Pilgrim's Mass, held daily at noon.
1pm: Edinburgh, Scotland
Cover your ears for the Castle's One oʼclock Gun, which has been fired from the battlements almost daily since 1861. Not open Sundays.
2pm: Jerash, Jordan
Come over gladiatorial at the Chariot Show, where sandalled warriors re-enact Roman entertainments in the cityʼs ancient Hippodrome. Sat, Sun, Mon, Wed, Thurs.
3pm: Istanbul, Turkey
Take afternoon tea in the piano-tinkled lounge of the Four Seasons Hotel.
4pm: Wagah, India-Pakistan border
Cheer on the gun-toting, foot-stomping one-upmanship between India and Pakistan, played out at the daily closing of the international border.
5pm: Memphis, USA
Watch as the resident mallards of the Peabody Hotel are led from the foyer fountain, along a red carpet, to their penthouse home.
6pm: Borneo, Malaysia
Wait at the entrance to Gunung Mulu National Park's Deer Cave to watch millions of bats make their en-masse evening exit.
7pm: Marrakesh, Morocco
Tantalise your tastebuds as the Djemaa el-Fna main square turns into an atmospheric open-air night market.
8pm: Hong Kong
Take your place on Tsim Sha Tsui Waterfront to watch the Symphony of Lights laser show sparkle over the skyscrapers.
9pm: Mauna Kea, Hawaii
Star-gaze from the top of 4,200m Mauna Kea: astronomy appreciation programmes are held at the observatory here every night, 6pm-10pm.
10pm: Buenos Aires, Argentina
Feel the power and the passion of tango at Torquato Tasso: sultry shows are almost nightly at this authentic San Telmo spot, Tues-Sat.
11pm: Reykjavík, Iceland
Last orders? No chance. Nowʼs the time to begin your Icelandic runtur (pub crawl) – at weekends most bars open til 4am.
You could try and zip around the world in 24 hours. Or you could spend 120 hours in the one lovely place! (Napa Valley contest is open to US residents only unfortunately, but anyone can download Lonely Planet's 15 free mini-guides to US summer destinations).