CASA DO PENEDO - PORTUGAL
Translated: "House of Stone"
It was originally built as a mountain retreat around 1974 by an engineer who was inspired by the natural space provided by four large boulders. Its unusual design has also stimulated a steady traffic of tourists who are not beyond peering through the windows or even trying to enter uninvited. The interior is larger than might be expected and is beautifully rustic with a large wooden bench-style table and balconies.
There have been several claims that Casa Do Penedo is a hoax created by a Photoshop artist but it is definitely real. It has been featured on Portuguese television, in the British Daily Mail Newspaper and on countless architecture websites.