London was founded as a settlement by the Romans, in 43-50 AD. They first bridged the Thames at the shortest point, where the modern day London Bridge now stands. They named it Londinium.
The camp there was later expanded into a busy port, with ships arriving to supply the armies that were intending to conquer the whole island. When their early town was attacked and burned down by the warrior Queen Boudicca, in 61 AD, they rebuilt it, with a stone wall acting as a defence against the warlike English tribes. At its peak, the new city was home to 45,000 inhabitants, making it the largest in Britain.
If you are interested in seeing what remains of the Roman city, there are some established exhibitions. But just wandering around some areas of The City of London will reveal fascinating remains of Roman buildings still standing; former fortifications, places of worship, and living accommodation.
Close to The Museum of London, you will find the Barbican, a housing and entertainment complex. A road runs down one side of this, aptly named London Wall. In this area, you will find many examples of Roman stone and architecture.
In Wallbrook, EC4, you can visit the remains of the Temple of Mithras, now housed in a new exhibition, called The Mithraeum..
This is free to enter, but places on the tour must be booked in advance.
If you are planning a visit to London to enjoy the sights and history of that city, make sure to take time to see the oldest remaining parts.