h2g2 The Hitchhiker's Guide to the Galaxy: Earth Edition

One of the (many) homes of the Queen of England and the largest residential castle in the world (apparently).

Higlights of the castle for visitors include -
Queen Mary's Dolls' House : Huge palatial doll house built in the 1920s.
St George's Chapel : 14th century chapel and Burial place of ten British sovereigns, also where Edward and Sophie were married in June 1999.
Paintings : The Queen's collection of art is one of the greatest collections in the world, and Windsor Castle has a great deal of it on show, including works by Da Vinci, Holbein, Rubens, Van Dyck and Canaletto.
The Gardens : recently restored to their original splendour - definitely a must for a picnic on a sunny day.

The State Appartments make up the bulk of the castle which you can visit and are well worth spending half a day touring round. Thousands of items of furniture, paintings, sculpture, porcelain and armour to enjoy. Favourite item - look out for the bullet that killed Admiral Lord Nelson, in one of the display cabinets.

Some of the armament rooms are an incredible sight - thousands of weapons (swords, pistols, pikes, etc) mounted on the walls in huge intricate designs.

There is also currently a display showing the restoration work that was needed after much of the castle was destroyed by fire in 1992 which is worth a look.

The castle is open all year round, bar one or two dates (such as Christmas, etc - do check in advance just in case).

You can get there by train from London (from Waterloo or Paddington), by coach from Victorai coach station, or by road - M4 to Exit 6, M3 to Exit 3.

Entry prices are usually £11 for adults and £5.50 for children (other variations do exist).