The Lloyd's building in the City is one of London's most striking examples of high-tech architecture. All the mechanical services are deliberately placed on the outside, giving it that inside-out appearance that was revolutionary when designed in the 1970s and completed in 1986.

Access requires booking a paid guided tour as the building isn't open for casual visits. The dramatic architecture philosophy of 'a machine for working in' shows from the exterior.

Pair it with a walk around the Gherkin and 20 Fenchurch Street (the Walkie Talkie) for a proper modern architecture tour. Monument tube is closest.