Locals call it the “Tulip” for its flared top, but officially it’s 22 Bishopsgate—a sleek, high-tech monolith in the City of London. This building is absolutely free to visit on weekends, offering panoramic views that rival The Shard without the ticket price. It’s also home to a public sky garden on the 60th floor, complete with benches and even a few trees.
Practical tip: Book your free spot online three weeks in advance—weekends vanish fast.
