People forget that London floods. Parliament has been under water, and in 1953, surges killed 307 people in the U.K. At least, London used to flood. The Thames Barrier is the city’s primary defense against it and comprises ten 20m (66-ft.) steel-and-concrete gates. These can be raised to block the 520m (1706-ft.) span of the river in just 10 minutes. Most of the time you can’t see the gates, which rest on the riverbed, but the piers that raise and lower them are always visible, strung across the river like a row of mini Sydney Opera Houses. At the visitor center you plumb the Barrier’s construction and, if you’re lucky, see a test raise.
Thames Barrier Visitor Centre
Unity Way, Woolwich, SE18
Our Rating Hours Thurs–Sun and bank holiday Mon 10:30am–5pm Transportation National Rail: Woolwich Dockyard or Charlton Phone 020/8305-4188 Prices Admission £4 adults, £3 seniors and students, £2 children 5–15, free for children 4 and under
MapUnity Way, Woolwich, SE18 London
Note: This information was accurate when it was published, but can change without notice. Please be sure to confirm all rates and details directly with the companies in question before planning your trip.