A trio of house tours this weekend worth checking out:

The 45th annual Dupont Circle House Tour and Tea takes place Sunday from noon to 5 p.m. and features five homes and buildings.

The Tapies is a nine-story structure of steel, masonry and glass and one of the city’s more unusual buildings. A 1920 brick home on Swann Street showcases the art of Robert E. Kuhn.

Kurdistan Regional Government’s U.S. headquarters is housed in a Victorian-era brownstone. The Scottish Rite Temple has been featured in the movies, “The Day the Earth Stood Still” and “The Lost Symbol.”

A 20th-century row house has an open, flexible green living space filled with sustainable technologies. It is one of the first in D.C. to use a “gray” water system — one that reuses bath and sink water.

Tickets are $40 in advance and $45 day of tour. Tea is included in the admission price. Tickets can be purchased online until Friday at 5 p.m. Tickets and tour booklets can be picked up on the day of the tour at the Dupont Circle Resource Center, 9 Dupont Circle (the small brick building south of the Metro on 20th Street and Massachusetts Avenue, across from the Farmers Market).

The Sandy Spring Museum’s “Homes and History of the Hawlings River Valley” is Saturday from 10 a.m. to 4 p.m. The biannual event showcases homes and other properties in the Sandy Spring neighborhood. This tour focuses on the Hawlings River Valley, which was one of the first settled areas in Montgomery County.

Among the properties featured will be Brooke Meadow (1823), Riverton (1848), Fairfield (1856), St. Luke’s Church, Brookeville Woolen Mill and home, Brookeville Woolen Mill Worker’s House. Several of these properties have been carefully restored to their original appearance.

Tickets are $35 and can be purchased at the museum, 17901 Bentley Rd., Sandy Spring, or online at http://hawlingshometour.eventbrite.com.

Tour the floating residences of Washington as part of the Southwest D.C. Waterfront Boat-Home Tour on Saturday from 10 a.m. to 4 p.m. Take a peek inside one of the largest liveaboard communities on the East Coast. Visit close to 20 houseboats, house barges, cabin cruisers and sailboats that people call home.

 Tickets are $20 and can be purchased at www.houseboattour.org. www.dchouseboat.org.