London, England: The City and St. Paul's Cathedral

The historic core of London is a compact district known as "The City." This is Britain's Wall Street, thriving with big time commerce and packed with banks and Sir Christopher Wren's churches. His masterpiece is lofty St. Paul's Cathedral, the symbol of London's resilience. Climb its 30-story dome for a commanding view. Subscribe at goo.gl/8iBEnS for weekly updates on more European destinations.

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