The classics. Pick one.

Altitude race.

Big Sky, USA · hard

Forest miles.

Robbinsville, USA · moderate

River miles.

Bilbao, Spain · easy

Parade miles.

Accra, Ghana · easy

Morning miles.

Santorini, Greece · easy

Beach miles.

Keramas, Indonesia · easy

Harbour miles.

Klaksvik, Faroe Islands · easy

2,640 meters. Everyone walks the hills. Everyone.

Bogotá, Colombia · moderate

40,000 runners, bacon stations, Folsom Field finish slide.

Boulder, USA · easy

Médoc châteaux, wine stations instead of water. Spit or regret.

Bordeaux, France · moderate

Green miles.

Bordeaux, France · easy

Park miles.

Sofia, Bulgaria · easy

Hopkinton to Boylston with Heartbreak Hill between. The qualifier of qualifiers.

Boston, USA · expert

Loop miles.

Boulder, USA · easy

Promenade miles.

Scheveningen, Netherlands · easy

Overlook miles.

Haysi, USA · moderate

Alpine race.

Breckenridge, USA · hard

Palace Pier start, Hove Lawns finish, sea wind as pacer.

Brighton, United Kingdom · hard

Medieval loop, begininhof quiet miles, chocolate finish.

Bruges, Belgium · easy

Cinquantenaire start, Atomium turnaround, fries at every corner.

Brussels, Belgium · moderate

Castle views both banks, Margaret Island finish. Perfect first half.

Budapest, Hungary · moderate

Rose garden loops, mate stands, polo fields nearby.

Buenos Aires, Argentina · easy

Riverside miles from Waibaidu to Lujiazui.

Shanghai, China · moderate

Prom miles.

Bundoran, Ireland · easy

River Taff miles.

Cardiff, United Kingdom · easy

Zoo loop.

Geneva, Switzerland · easy

Trail miles.

Jackson, USA · easy

Pink lagoon trails.

Pichilemu, Chile · easy

Waterfront dawn miles.

Cairns, Australia · easy

Giza plateau at dawn, camels as spectators. Heat management 101.

Cairo, Egypt · hard

Towpath miles.

Fort Augustus, Scotland · easy

Evening miles.

Montreal, Canada · easy

Towpath miles.

Bude, England · easy

Beach-path miles at 6 AM.

Canggu, Indonesia · moderate

Palms, yachts, red carpet finish line energy.

Cannes, France · easy

Rim miles.

Rodellar, Spain · easy

Canyon miles.

Maple Canyon, USA · easy

Hilly lighthouse circuit.

Byron Bay, Australia · moderate

Soft sand miles.

Cape Maclear, Malawi · easy

56km over Chapman's Peak. The world's most beautiful ultra, allegedly.

Cape Town, South Africa · expert

Castle start and finish, bay loop middle, crowds the whole way.

Cardiff, United Kingdom · moderate

Forest trails behind the palace.

Madrid, Spain · moderate

White cliffs, turquoise inlets, finish swim at Port Pin.

Cassis, France · hard

Waterfront miles.

Port Louis, Mauritius · easy

Farmland miles.

Waitomo, New Zealand · moderate

Morning miles.

Jaipur, India · easy

Hout Bay to Noordhoek above the cliffs. Wind decides your pace.

Cape Town, South Africa · hard

Esplanade miles.

Boston, USA · easy

Dead flat, screaming crowds, personal best territory.

Chicago, USA · hard

Dawn miles past the elephants.

Kasane, Botswana · moderate

Park miles.

Brussels, Belgium · easy

Park miles.

Lille, France · easy

Canyon miles.

Salt Lake City, USA · easy

Cliff miles.

Siurana, Spain · easy

Coast path run.

Sennen Cove, England · hard

Sunrise miles.

Uluwatu, Indonesia · easy

Morning miles.

Varkala, India · easy

Coast miles.

Thurso, Scotland · moderate

Trail miles.

Porto Covo, Portugal · easy

Boardwalk miles.

Ericeira, Portugal · easy