Million-dollar manses can come with long histories or short ones. Here is one 18th-century example, and one built circa 2004:

$1.1 million

Milford Township

2045 Hillcrest Rd.

Taxes: $5,824

Situated on 4.5 acres in Bucks County, this structure was originally Achey's Mill, built in the 1760s; it was converted into a home in 1971. The reinforced-concrete bridge over the creek was designed by Henry Mercer. The first floor features an eat-in kitchen and open great room, a living room, and a powder room; a wraparound deck off the dining area overlooks the creek and woods. The second floor has four bedrooms, a full bathroom, and a library with large windows and built-in bookcases. On the third floor are complete living quarters: kitchen, full bath, two bedrooms (one is a loft), and an office area. There are open-beam ceilings, four stone fireplaces, hardwood floors, a finished walk-out basement, and a security system.

Broker: Diane Williams, Weichert Realtors; 215-643-7776 or 215-882-4627.

$5.6 million

Gwynedd Valley

Fording Brook Road

Taxes: $46,069

One of five houses on a private cul-de-sac, this three-year-old dwelling, set on 2.76 acres, has six bedrooms and 10 bathrooms. Included are a carriage house with an office and full bath, garage parking for five cars, a formal living room, a dining room, a sunroom, a first-floor office, a sunken family room, both a butler's pantry and a walk-in pantry, and a gourmet eat-in kitchen with a breakfast room. A patio overlooks the backyard. The basement offers an exercise room, a media room, a playroom, a second family room with a full bar, a wine cellar, and a full bath and sauna. The master suite has a fireplace, a full dressing room, and two walk-in closets.

Brokers: Vanessa Klein, Anna Slatowski, Coldwell Banker Preferred; 215-641-2727 or 610-564-0731.