London Open House (day 1): Blimey, what magnificent late summer weather for a stroll around town looking at buildings. Lots of buildings, as it turned out. I even managed a walk through the middle of HMTreasury (past the coffee bars where scores of civil servants must have been fretting this week over a snatched latte), which isn't something you can do every weekend. Same again tomorrow?
William Booth College: If you're training to become a Salvation Army Officer, you'll spend two years here in the southern suburb of Denmark Hill. The college was designed by Sir Giles Gilbert Scott, and is built throughout in typical Twenties austere brick. There's a main Assembly Hall where ceremonial flags are paraded, and in which the faithful meet before a Blood & Fire emblem. But the most noticeable feature is the 190 foot tower which dominates the local skyline. For Open House, visitors were allowed to climb to the top. First up three floors in one of the oldest operational lifts in London (they filmed Poirot here, it's that old). And then a succession of red spiral staircases, the first 58 steps to the mobile mast gallery and the final 58 to the very top. From way up here, on a gorgeous sunny day like today, there's a fantastic view in all directions. From the City round to Canary Wharf, and Crystal Palace round to Battersea Power Station, all with ordinary modern estates in the foreground. Join the Sally Army and you might be able to sneak up here for an after dark panorama, or even to watch the New Year fireworks. Well worth the tottery ascent, and another unique Open House experience.
Royal Institution: Behind a pillared facade up a Mayfair sidestreet, an astonishingly high number of major scientific discoveries have been made. Here ten chemical elements were first identified, the first electric generator was powered up and the first laser beam was fired. You can see many of these pioneering experimental gizmos in a new museum in the basement of this just-reopened building. It's not yet quite complete, but the illuminated periodic table is ready for you to bash in time to Tom Lehrer's song The Elements. Upstairs is the Lecture Theatre, as viewed every year at Christmas on the TV. I got to sit on the newly refurbished pink seats and look down on the famous bench at which so many discoveries were first demonstrated. There's plenty for visitors to see scattered through the corridors and libraries, and a busy programme of upcoming events to herald the Institution's rebirth. Expect to hear a lot more from Albermarle Street in the future.
Marlborough House: This is one of those grand houses overlooking The Mall, the posh villas originally built by nobles but later snapped up the Royal Family. Not surprisingly the Duke of Marlborough built this one. His wife the Duchess supervised the interior design, shamelessly butchering a set of ceiling murals from the Queen's House in Greenwich by shrinking them down to fit her own central saloon. There are two main staircases, both fabulously decorated with oil paintings of the Duke's famous wartime victories. The house later passed on to the future Edward VII and his wife Alexandra. Hunt round the back of the garden and you might find gravestones to Caesar (Eddie's beloved fox terrier) and Bonny ('favourite rabbit' of the Princess of Wales). For the last 50 years the house has been at the disposal of the Commonwealth Secretariat, and world statesmen meet here every now and again to discuss matters of trade and sustainability and global stuff. Everyone has a seat crammed round the long oval table in the Red Drawing Room, arranged not by importance but in alphabetical order (the UK falls between Uganda and the United Republic of Tanzania). A most elegant setting for such international relations.
Lambeth Palace: It's always tough to decide where to visit first on an Open House morning, and when to arrive. The ideal building is a rarely open architectural big hitter, and the ideal time is before the day's mammoth queues descend. I plumped for the Archbishop's pad on the Thames Embankment, and turned up an hour before opening time to ensure I was on the second tour and not still waiting round the corner at noon. We got a 50 minute look round, starting in the Crypt Chapel (which used to flood when the river was wider). There's a surprisingly spacious courtyard at the heart of the building, and a far bigger ornamental garden beyond. Outside the Great Hall is a 16th century fig tree, and inside is a spectacular hammerbeam roof carved with Moorish busts above the library. We were treated to tales of murdered archbishops, but didn't catch sight of the present incumbent (even though he was in the building somewhere). And finally to the main chapel, to sit on a bishop's chair beneath modern muralled vaulting. The complex is now too small to host the once a decade Lambeth Conference, but remains grand and reverential inside.