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European tech hubs hoping to rival Silicon Valley

Virtual image of Paris' prospective incubator for 1,000 start-ups

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"Silicon Allee" may not have the same ring as Silicon Valley, but California's success in turning out technology giants like Facebook, Apple, Yahoo and Google has spawned other would-be "Silicons" across Europe.

Aspirants include the well-established Tech City in London, as well as newer hot spots like the small Baltic countries.

Factors that can make or break a "Silicon wannabe" include a strong education system, solid political, economic and legal systems, technical infrastructure, engineering talent and funding opportunities.

Read on to find out which European "Silicons" may have what it takes.

View more: Fierce competition in Silicon Valley

—By CNBC's Katy Barnato. Contribution from Arjun Kharpal.