I'm a huge LEGO fan. I am also a huge Harry Potter fan. This year I got the Harry Potter Knight Bus, and the castle of Hogwarts as a present by my parents. This is the building of Hogwarts from start to finish. (This one takes about 4 hours to complete)

First I put all the little figurines together.

The bottom part of the bridge

Arch ways for the bridge

Small towers and mechanics in the bridge

The bridge is complete

Bottom part of the first tower

Walls and windows of the first tower going up

Quidditch gear and bannisters going up

The globe and roof in place

Tower roof is on, and the tower is connected to the bridge

The divination tower now has a crystal ball, and tea cups for tea leaf reding

Bottom part of the second tower

Professor Lupins office

The mirror of erised is in the top tower, of course

The second tower is complete

Gregory Goyle is going down the stars, while a death eather is standing outside. (I do believe it's Lucius Malfoy)

Professor McGonagall coming out of the headmasters office

Harry Potter in the quidditch room

Neville Longbottom in the divination tower

Watch out - that's a dementor lurking over the school

And here is the whole castle!