Greenwich, a borough of London, is home to the Royal Observatory. From here, the world’s longitude is measured from the prime meridian, and Greenwich Mean Time sets the global time standard. At the port, the clipper ship Cutty Sark, one of Greenwich’s renowned historic landmarks, is preserved as a fascinating museum. Upriver, London is home to Buckingham Palace, the Houses of Parliament and Westminster Abbey. In addition, this major economic and cultural hub boasts a long tradition of arts and architectural innovation—from Shakespeare’s Globe Theater to West End musicals.