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City Of London Walk: Self-Guided Route + Map - Anywhere We Roam
Today, the Temple of Mithras (or London Mithraeum) sits underneath Bloomberg's European Headquarters. London Mithraeum (free to enter) has a small museum before stairs descend to the temple. Entry is every 20 minutes and begins with an immersive light and sound show, after which you are free to walk around the temple walls.