43. Steelyard Passage Where? Creepy underpass beneath Cannon Street station, linking All Hallows Lane and Cousin Lane. What? Of all the byways we've commended in this column, none has presented such a singular collection of historic factlets and neoteric curiosities as Steelyard Passage. The Victorian brick arches are immediately atmospheric, plunging the passage-goer into an otherworldly darkness that banishes the open skies of the Thames. The first thing you notice is the azure lighting that......

It's far too nice to be inside tonight so we can't help but suggest you mosey on down to the river and enjoy the rays. Head down to the Tate Modern and enjoy the Street Art exhibition that's been daubing the external walls of the Tate Modern since for the last month of so. Then talk a short stroll to the nearby The Anchor pub and enjoy their riverside beer garden till sunset.......

Here's an idea. Build temporary cofferdams in historic stretches of the Thames so that archaeologists can really get to work. It's amazing what you can find beneath a river that's served a city for 2000 years. Image by M@. Got an idea for a Touch Up London? Check out our archives, and send your own figments to londonist - at gmaildotcom.......

Something surprising is happening in our fair river: Conservationists have found seahorses among the muck in the Thames. More exciting, the seahorses are a rare short-snouted breed -- Hippocampus hippocampus, for you bio fiends out there -- that usually live around the Canary Islands and Italy. Seems like a long way to travel for a horse with no legs. The little creatures, which normally live in shallow muddy waters, estuaries or seagrass beds, have been......