A custom-built circular and oval home for sale in Marshalltown is filled with character and unique design surprises.

A four-level "quadplex" penthouse located in the skinniest skyscraper on Manhattan 's Billionaires Row just hit the market ...

The 25-foot-wide Gilded Age home spans 11,500 square feet, features grand spiral staircases, a wine cellar and outdoor space ...

This A-frame home south of Ames sits on three acres of woodland, a contemporary design, and views of the woodlands.

Scholars believe that stairs are more than 6,000 years old, predating Christ; their exact age cannot be determined. (21 ...

Supporters say the move could lead to more affordable, family-sized units, while fire safety officials urge cautious approach ...

To access the first floor, you have to ascend a grand staircase or a tucked-away stone spiral staircase from the lounge. There are four generously proportioned double bedrooms and each one has a ...

On the rest of the first floor, Bradley modified door openings for a better flow, pulled out the back stairs, and built a deck with a spiral staircase that connects it to the new, second-floor deck.

Scientists claim to have discovered eight vertical cylinder-shaped wells, known as shafts, surrounded by “spiral staircases” under the Khafre Pyramid. These shafts extend over 6,500 feet across and ...

Forbes contributors publish independent expert analyses and insights. Jamie Carter is an award-winning reporter who covers the night sky.

Built in 1985 on a 1.5-acre property, the home features a 3,000-square-foot master suite spread across two floors, complete with huge closets and a secret spiral staircase leading to an indoor pool.

A glowing blue spiral was spotted in European skies on Monday evening, causing a stir on social media. The swirls were seen across Europe with reports of sightings from the United Kingdom ...