$2,750,000

Frank Furness designed this jaw-dropping Rittenhouse Square townhome sometime in the late 1800s. It's a massive 5-bedroom, 7-bath home that clocks in at 5,703 square feet. It's also double the width of a traditional rowhome. There's also an interior courtyard, and a garage with four parking spaces.

$614,500

This home was designed by Philly architect Frank Weise, who is known for his modern marvels in the area. Within the 1,300-square-foot home there are three bedrooms and 2.5 baths. There are plenty of custom-designed details, including the built-in benches in the dining area and the three-story windows at the rear, which make for a light-and-airy home.

$425,000

This 1-bedroom, 1-bath corner penthouse is in the Society Hill Towers, which were designed by starchitect I.M. Pei. The 830-square-foot unit features 11-foot-tall windows with views of Independence Hall, and the Delaware River and a brand new kitchen and bathroom.

$699,000

This home was designed by Philly architect Robert McElroy and has listed for the first time in 14 years. It's tucked away on a woodsy .79 acres and built into a hill. The 4-bedroom, 3-bathroom home is located in Penn Valley, near the edge of the Schuylkill River and about a half-hour from city limits.

$830,000

Architect Arthur Miller designed this home for himself in 1958. The walls were quarried from the hill that it's tucked into and like its Robert McElroy neighbor (#5), it's surrounded by woods and sits on three acres.

$1,295,000

Robert McGoodwin, the architect behind much of Chestnut Hill and Mt. Airy homes, designed this French Norman-style stunner for the famous Woodward family in 1929. It sits on its own private lane and features three working fireplaces, Mercer tiling, and a winding staircase. Out back, there are two patios and a pool.

$365,000

According to the listing, this 3-bedroom, 2.5-bath home is believed to have been designed by Robert McGoodwin as one of the first properties in Andorra. It features the classic Wissahickon schist stone, a large backyard, and a two-car garage.

$2,999,999

Ah, the legendary Pitcairn House that just can't find a buyer. The midcentury modern gem was designed by Richard Neutra in 1962 and features an impressive six bedrooms and 5.5 baths. It's undergone multiple price chops in the two years it's been on the market.

$2,450,000

This Tudor revival home in West Mt. Airy is the work of two notable Philly architects: Charles Barton Keen and Sydney Martin. Keen designed the original home in 1911, while Martin later led the renovations in 1930. There's some beautiful detailing inside, from the winding grand staircase to the crown molding throughout. There's also a carriage house and tennis court on the 3.69-acre property.