 GEOG: When Holmes, Watson and the police sail out on the police  launch to lay in wait for the Aurora they sail upstream and under  the Westminster Bridge as indicated by Big Ben and the Houses of  Parliament in the background. Yet the Aurora was hidden at a ship  yard near the Tower Bridge, and when the hunt begins the Tower of  London is visible in the background. Both Tower Bridge and the Tower  of London are located down the river from Westminster Bridge.