Beneath the Tower Bridge in London:this river
Landmark crossing over the River Thames becomes latest global attraction ... 
London Tower Bridge glass walkway unveiled  Tower Bridge's new .... to see 
London's red buses and black cabs zip beneath their feet or gaze at... [DOC] [TLE] Tower Bridge opens glass-floored walkway 42 metres above river ... [PAR] Nov 10, 2014 ... A visitor crosses Tower Bridge's new glass walkway over the River Thames ... are 
not actually that high, you can see everything in detail beneath you.