The revamped and expanded Common Boston festival will have dozens of architecturally significant sites opening their doors for free behind-the-scenes tours on June 4-5. Test your knowledge of these four before getting the grand tour, and check out the full lineup of participating locations—plus deets on a June 3 kickoff party—at commonboston.org.

1) As Tiffany & Co.’s first design director, Louis Comfort Tiffany was best known for his bling and stained-glass lamps—but he also designed the Art Nouveau-influenced Ayer Mansion as a home for Frederick Ayer, who made a fortune slinging sarsaparilla and other patent medicines. The only surviving residence Tiffany designed from the ground up, the Back Bay beauty now serves as…

A. A home for Boston’s oldest members-only social club

B. A doctor’s office with an Ayer’s Cherry Pectoral cough syrup display

C. A residence for university women affiliated with Opus Dei

D. A museum that occasionally hosts Tiffany pop-up shops

2) Jamaica Plain’s Eliot Hall was constructed as a public meeting hall in 1831, but since 1878, the Greek Revival building has been home to the Footlight Club, America’s oldest community theater (which closes its 139th season with The Sisters Rosensweig on June 3-18). The new digs were roomier than the venue that had hosted the club’s first few performances, which took place in…

A. The back of a train station

B. A Brahmin socialite’s parlor

C. A popular tavern

D. A church’s bell tower

3) Official city architect Arthur H. Vinal designed the High Service Pumping Station—now the Metropolitan Waterworks Museum—in 1886-87, using a Richardsonian Romanesque style that makes the place look more like a majestic monastery than an industrial building. You can still see the massive steam engines that supplied Boston with drinking water from the Chestnut Hill Reservoir, which at their peak pumped nearly…

A. 1 million gallons a day

B. 10 million gallons a day

C. 50 million gallons a day

D. 100 million gallons a day

4) In the early 19th century, more than 8,000 operations were performed in Mass. General’s Ether Dome, including the first successful public demonstration of anesthesia. Designed by Charles Bulfinch—the first American-born architect—it’s still used as a teaching amphitheater by the hospital today, and it’s still home to someone who was present for that fateful demonstration in 1846, namely…

A. A teaching skeleton nicknamed Egbert

B. Padihershef, an Egyptian mummy gifted to the hospital

C. The ashes of ether pioneer William Thomas Green Morton

D. A watchful taxidermied owl

Answers below…

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1-C; 2-A; 3-D; 4-B