Castle Trail, Mount Falcon Park John Brisben Walker dreamed of a "castle in the clouds" or, as the project became known, a "Summer White House." The entrepreneur in the early 1900s envisioned U.S. presidents vacationing on his scenic mountain property not far from Colorado's Capitol. But fundraising failed, and the dream crumbled to the foundation that remains today, along with a 1911 cornerstone at the edge of a cliff.