Step inside the US' new $1 billion embassy in London — the most expensive embassy ever constructed

US ambassador to the United Kingdom Robert "Woody" Johnson showed media around the new US embassy in London on Wednesday.

Slated to open January 16, the new 12-story glass embassy cost $1 billion — the most expensive embassy ever built.

It's been described as a crystalline "sugar cube" and a "modernist museum" that expresses openness and transparency — a far cry from the old fortresslike embassy that embodies a brutalist architectural design, according to the Washington Post.

But make no mistake — the new embassy is highly secure and, as CBS notes, has been described as an "urban fortress."

Take a look inside:

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