You have probably seen Bishops Castle on any number of television programs. The castle sits on highway # 165 near the town of San Isabel, CO.
Jim Bishop is a one man work horse and has been building this castle for approx 40 years. Since finding the ground and starting this project as a teenager Jim has had some intermittent help. The death of his son on this ground spurs him on the continue the project, although I've never heard if there is an actual plan to finish.
The second level is open for large groups of people and weddings take place year around. Notice the tiny windows on the second level. These were all donated and arrive by mail, each is a reflection of the person who sent it. The gold dome has a bell in it and when you reach that point you can ring it. Notice the iron work around the castle - Jim Bishop has a shop and does custom iron work out of Pueblo. There are numerous staircases inside and outside of the castle, most are narrow and steep. The iron ball in the center of the castle is approx 20 across and 20 feet high. The plan is to some day cover it with mirrors. The "East Tower" is now under construction and can be seen from the road.
The rock that forms this castle comes from the local area, funds from visitors help keep it going. The head of the dragon is approx 20 feet long and has propane set up to shoot fire out of it's mouth on special occasion. You are allowed to access any part of the castle at your own risk and must sign a waiver when you enter. The stories you hear about Bishops Castle and it's creator are true. Both the castle and the creator are colorful parts of Colorado.
http://www.post-gazette.com/pg/06211/709125-37.stm
Information Herein Deemed Reliable but Not Guaranteed
Look for me on Active Rain, Facebook, Twitter, Linked In,Trulia, posterous, Zrii
and various other social networking sites: Google Me! 
All materials and photos copywritten
There's a buck and lunch in it if you do it!
Thank you all for the comments. Every once in awhile you will see the castle on HGTV - extreme houses and the like. If you are in the area it's worth the drive, a bit isolated and make your stops before you get there. It's a VERY pretty area and an unusual structure. I try to stop in about once a year, you can see more progress that way.