The Tower of London is a medieval fortress. It was founded by William the Conqueror in 1066. It has been declared Heritage of humanity by unesco. It is in excellent condition.
Actually the Tower is palace, jail, chapels, gallows and museums, all together within the walls.
It is located in East London and the best way to get there is by the river, passing under the London Bridge, but you can also do it by subway or by bus.
The tour lasts a whole day, there is much to see.
Ideally, go first thing at Waterloo Barracks let me see Crown jewels To do it more comfortably. It is worth stopping to contemplate the diamond First Star of Africa 530 carats in the scepter of Carlos II. Or the 2,800 diamonds in the Imperial State Crown. Or the Koh.I-Noo diamond from India, in the crown of the queen consort.
There is guided tours by Yeoman Warders or Beefeaters who guard the tower since 1485, who surely will kindly agree to take a picture with you.
A curiosity: the day they disappear from the Tower the seven crows who takes care of the Raven Master, the monarchy will fall in the United Kingdom. That’s why you can see the queen’s pets flying at pleasure through the gardens.