7. Dales and Moors, Yorkshire, England
440 kilometers (270 miles) from Kendal to Whitby
This one-day ride across North Yorkshire offers nonstop bends, fast straights, wild scenery and gentle vales dotted with market towns.
The A684 launches you over the Pennines to Hawes, gateway to the Yorkshire Dales National Park via Aysgarth to Leyburn.
Turn south here to Masham for Ripon and Thirsk, then over the heather-clad moors via Pickering to drop down to the peaceful fishing village of Whitby, where you can celebrate an exhilarating ride with fresh fish 'n' chips and a pint of ale.
White Rose Tours, +44 01423 770 103
8. Fjordland, Norway
450 kilometers (280 miles) Bergen to Andalsnes
The land of the Vikings is biking Nirvana. The road network takes in terrific switchbacks and awesome fjords -- some crossed by ferries.
You begin in Bergen and head for Gudvangern where a ferry takes you through Naerlandsford, the world's longest and deepest fjord.
Beyond Belstrand, you'll need to drop gears as you climb over Gaularfjell to Moskog, then Stryn and Eidsdal, where a ferry links to the Trollstigen road, zigzagging crazily to deliver you exhilarated to Andalsness.
Edelweiss Bike Tours, +43 5264 5690
9. Istanbul to Anatolia, Turkey
2,980 kilometers (1,850 miles) Istanbul to Anatolia
Istanbul provides a superb starting point for an exotic circuit, taking in Cappadocia's troglodyte houses, ancient Roman and Byzantine ruins and the beauty of the Black Sea and Taurus Mountains.
More on CNN: Best of Istanbul
A ferry across the Sea of Masmara links you to Bursa, then Safranbolu, and the eerie volcanic landscapes of Cappadocia, riddled with Christian churches.
A ride west via Konya to hit the Aegean coast -- taking in the Greco-Roman town of Ephesus -- closes the loop.
MotoDiscovery, +90 830 438 7744
10. Chasing Che, Cuba
2,000 kilometers (1,240 miles)
Chasing Che Guevara's ghost down the highway of an enigmatic Communist island nation that resembles a Hollywood stage set is a thrill in itself.
Classic American cars and creaky ox carts are companions on your clockwise loop from Havana to Baracoa, with plenty of time for salsa, cigars and rum.
More on CNN: What to do in Havana
For five decades forbidden fruit, Cuba recently opened to U.S. citizens on licensed group motorcycle tours offered by Texas-based MotoDiscovery.