This document summarizes key details about Tower Bridge in London. It notes that Tower Bridge has stood over the River Thames since 1894 and is one of the most recognizable bridges in the world. The middle section can be raised to allow large vessels to pass through, with each section weighing around 1000 tons and able to be raised in just over a minute. While the bridge used to be raised 50 times per day, it is now only raised 4 to 5 times per week.