Home to the world-famous Kirov Ballet and Opera company, a visit here is a must, if only to delight in the sparkling glory of the interior. Use the website to book and pay for tickets in advance of your visit to the theatre and to the acoustically splendid new concert hall, which is nearby. The theatre-themed souvenirs are for sale in the Mariinsky gift shop. None of it is cheap, but where else can you get a ‘Property of Kirov Ballet’ T-shirt?