As if scaling tall monuments or dangling over canyons weren't enough to make you wanna crap yourself, tourist sites have gone all EXTREME in recent times and added glass-floored observation decks. The Grand Canyon added the Skywalk; the Eiffel Tower installed a glass floor. And now, London\u2019s Tower Bridge has its own vertigo-triggering view. Just look at that thing.\n\nThe first of two new glass observation decks opened Monday on the West walkway of London's historic bridge (not to be confused with the one people sing about falling down), treating visitors to panoramic city views and renewed heart palpitations.\n\nSuspended 138ft above the Thames, the new glass floor offers views of the river and the iconic bridge lifts, which regularly fold up to let large ships pass. So if looking straight down 13 stories weren't enough, you'll see a bridge moving beneath your feet, too. Gulp.\n \n\nTower Bridge has a new glass floor. Could you walk over it? http:\/\/t.co\/QZ6sOZEDNN pic.twitter.com\/R1v8NchJn6\n\u2014 Evening Standard (@standardnews) November 10, 2014\n\nThe East walkway's set to be completed by Dec. 1, and both floors will comprise six reinforced glass panels, each weighing approx. 1,168 pounds. But really, there's no amount of glass that'll make these seem safer than, say, metal. Just look at what happened in Chicago a few months ago.\n\nCheck out a dizzying, POV view from Tower Bridge's new walkway in the hyperlapse video below, and watch people, buses, and those spectacular bridge lifts in action.\n\nAnd if you can muster the courage to visit, order tickets for $14 here.