When this theater designed by Sir Denys Lasdun opened in 1976, Londoners weren't all so keen on the low-slung Brutalist block. Prince Charles described it as "a clever way of building a nuclear power station in the middle of London without anyone objecting." But whatever its merits or demerits, the National Theatre's interior spaces are worth a visit. Interspersed with the three theaters—the 1,150-seat Olivier, the 890-seat Lyttelton, and the 450-seat Dorfman—is a multilayered foyer with exhibitions, bars, restaurants, and free entertainment. Musicals, classics, and plays are performed by top-flight professionals. The Clore Learning Centre offers courses and events on all aspects of theater making, and you can watch staff at work in the backstage workshops from the Sherling High-Level Walkway.