Tickets and Getting There.
Tickets for the Tower can be purchased at the ticket kiosks on Tower Hill near the main entrance to the Tower. There are rates for adults, seniors, children and for groups. Because this is a very popular attraction, the lines to buy tickets can be quite long.
Consequently, it is better to purchase tickets online before you arrive at the Tower. If you place your order more than 10 days in advance, the tickets will be mailed to you. If not, you have to pick them up at the Tower. Ticket in hand, you simply go through the ticket holders entrance. (See The Tower's official website).
You can also enter the Tower using various combination passes such as London Pass that give you admission to several attractions for a single price.
The Tower is very easy to get to. It is located on the north bank of the River Thames just east of the City of London (London's main financial district), Take the London Underground (Circle Line or District Line) to the Tower Hill Station and when you emerge you will be right at the Tower. It is also on the route of the various hop-on, hop-off buses that operate in London.
Perhaps the most interesting way to get there is to take one of the boats that travel along the Thames between the Houses of Parliament and the Tower. Along the same lines, if you are a good walker, you can walk along the Thames to the Tower from the Houses of Parliament.
Above: he former officer's quarters building houses the Royal Fusilier Museum. Formed in 1685, the Royal Regiment of Fusiliers was formed for the purpose of protecting the Tower's guns. This building still remains the regiment's official headquarters.
Cruise destination - England - Visiting the Tower of London - page 3