It's not the only way into Exhibition Place, but the Princes' Gate - not the Princess Gate, an artifact of people who decide things are named after what they sound like - is pretty much the property's main entrance, if only because of the ornate presence of the structure, built in 1927 and full of the heavy architectural artistry that was common in that era. Here, at night, the contrast between the lit stone and concrete of the Gate and the sky beyond is striking, to say the least.
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