From mega-mansions and posh penthouses, to tiny homes and off-grid living, Colorado is full of unique real estate and housing options.

Another alternative form of architecture found in Colorado is earthbag homes. These dwellings are typically made from bags full of dirt or sand, that are then stacked between barbed wire, and topped with poured concrete. Not only are earthbag homes environmentally friendly and sustainable, but they are also great for builders on a budget.

Zillow gives a peek inside of an artistic Colorado earthbag home, which is also now available to rent via Airbnb.