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St Katharine Docks were one of the commercial docks serving London, on the north side of the river Thames just east (downstream) of the Tower of London and Tower Bridge. They were part of the Port of London, in the area now known as the Docklands, and are now a popular housing and leisure complex.
The docks were officially opened in 1828 but never fully recovered after being badly damaged by German bombing during the Second World War and in 1968 were sold to the Greater London Council. Most of the original warehouses were demolished and mostly replaced by modern commercial buildings in the early 1970s, with the docks themselves becoming a marina. The development has often been cited as a model example of successful urban redevelopment.
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Docks Website: Link

Tower Bridge is a combined bascule and suspension bridge over the River Thames. It is close to the Tower of London.

The bridge consists of two towers which are tied together at the upper level by means of two horizontal walkways which are designed to withstand the horizontal forces exerted by the suspended sections of the bridge on the landward sides of the towers.

More details from Wikipedia Link

The Tower of London was started by William I in 1080 and has been added to by various monarchs over time. For a fuller history see Link
Most of the site is both a scheduled ancient monument and Grade I, II* and II listed. Link
Website: Link
Wikipedia: Link

City Hall was the headquarters of the Greater London Authority (GLA). It is located in Southwark, on the south bank of the River Thames near Tower Bridge. It was designed by Norman Foster and opened in July 2002.
Website: Link

The 180 metre tall sky scraper at 30 St Mary Axe, London was designed by Lord Foster (Foster and Partners) and opened in 2004.

Offices fill the 40-storey 48,000 metre floor space. Constructed in a thin-shell structure and thousands of flat glass panels. The building's distinct curved shape gave it its nick-name The Gherkin. It building has also been known as The "Swiss Re" Building, after the reinsurance firm which occupies it, and commissioned the building for their head offices.