Hot water geysers dominate Reykjavik's landscape.

Frozen in time, Havana reveals some of its secrets; meet the photographers of the Cuban revolution and learn about the reality and role of socialism, baseball and salsa dancing, and visit the rooftop gardens that feed 90 percent of the local population.

Moscow is located between five rivers and seven seas and is known as the global capital of the outrageous.

The oldest city in France is a city of contradictions.

The people of Buenos Aires, known as the Paris of the Americas, live life to the fullest.

Lisbon has been transformed over the past 20 years into Europe's most cosmopolitan city.

A city with a history of the trend and counter trend, San Francisco is home to living a greener and simpler life.

With more than 50 percent of its population under the age of 24, change is being ushered in by Cape Town's youth; optimism, hope and resilience pit themselves against the lingering wounds of apartheid.

Tel Aviv is the international capital of Bauhaus architecture and an example of tolerant co-existence.

Bangkok is a city in motion; traffic is impossibly dense: cars, boats, overcrowded streets; beneath the culture of chaos, this Buddhist city possesses a deep and permanent respect for well-being.

Helsinki, a leader in social policy, innovator in telecommunications and the sauna capital of the world, is composed of 150 islands.

More than 80 languages are spoken on the streets of the Australian city of Melbourne.

Having been defined by NASA, petroleum and cowboy ways, Houston is surprisingly liberal.