Inside the most expensive embassy ever constructed

The U.S. Embassy in London moves next month to a new billion-dollar home overlooking the River Thames - just as U.S. President Donald Trump's actions have placed strains on the "special relationship" between Britain and the United States. The 518,000sq ft building is believed to be the most expensive embassy in the world, featuring state-of-the-art security systems, neon structures, frosted glass walkways, etc.