Don't judge a home by its exterior -- because the inside of this old cement factory will blow you away

Remember how we are constantly reminded not to judge a book by its cover?

Well, the concept has never been more applicable than in the case of this building that was formerly a cement factory.

Located just outside of Barcelona, it was  a WWI-era pollution machine that had closed down, reports Bored Panda.

An architect, Ricardo Bofill had stumbled upon the rundown place in 1973 and saw a world of possibilities.

Now after almost 45 years, he has completely transformed it into one of the most stunning homes ever.

Check out the gallery for more details.