The easiest was ridiculously easy, though it allowed players to find the various secret passages without just dying over and over again.

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The audience then walk through secret, maze-like passages beneath the ground that are rarely seen by the public, leading them from one building to the next.

BBC: News, London

At the summit, visitors are rewarded with stunning panoramic views of the city and its surroundings, while inside a world of secret rooms, museums and unexpected passages awaits.

BBC: Under-explored day trips from top European cities