Documenting the locations, historical background, and architectural context of hidden gems across our curated destinations.
Step inside the Ether Dome at Massachusetts General Hospital: the 1821 surgical amphitheater where ether was first publicly demonstrated as anesthesia on October 16, 1846. Home to a mummy, a statue of Apollo, and the birth of painless surgery — free to visit on weekdays.
Step inside the Mapparium at the Mary Baker Eddy Library: a three-story stained-glass globe showing the world exactly as it was in 1935, from Siam to Italian East Africa. Discover its whispering-gallery acoustics, the story of architect Chester Lindsay Churchill, and everything you need to plan a visit.
The Vilna Shul at 18 Phillips Street is the last surviving intact immigrant-era synagogue in Boston, built in 1919 by Lithuanian Jewish immigrants. Its sanctuary holds rare pre-war murals and pews with a double history, all preserved within a plain Beacon Hill facade. Now Boston's Center for Jewish Culture, it hosts tours, exhibits, and community events.
Fort Warren on Georges Island is a granite Third System fort in Boston Harbor that became one of the Civil War's most famous prisons, holding Confederate Vice President Alexander H. Stephens. Built over 1833–1861 and obsolete before it opened, the fort also gave America the melody of 'The Battle Hymn of the Republic.' Reachable by ferry from Long Wharf, its casemates, parade ground, and famed ghost lore are open to visitors.
Behind an ordinary brownstone facade at 137 Beacon Street, nothing has changed since 1954. The Gibson House Museum is Victorian Boston preserved room by room, exactly as one devoted son left it.
Four stories tall, ten feet wide, and famous for a feud that may never have happened. The Skinny House at 44 Hull Street is Boston's narrowest home — and one of its most photographed.
Fort Tilden is a 1917 coastal artillery fort turned Cold War missile site at the edge of the Rockaways — now abandoned batteries and trails in the Gateway National Recreation Area. See empty gun emplacements, rusting observation towers, and artists' studios before exploring one of the city's wildest shorelines.
Eero Saarinen's 1962 TWA Flight Center at JFK — a concrete bird frozen mid-flight — sat empty for 18 years after TWA's collapse. Now reborn as the lobby of the TWA Hotel, its restored sunken lounges, red carpet, and split-flap departure board are open to visitors, no ticket required.
Beneath City Hall Park sits the most beautiful subway station New York ever built — closed since 1945, seen today only from a moving train or a members-only tour.
Beneath Riverside Park runs an abandoned 1930s freight tunnel — a mile of murals, a former underground homeless city, and some of the most famous graffiti in New York history. The tunnel is an active Amtrak corridor again and entirely off-limits.
Before Central Park existed, 300 people — mostly free Black property owners — lived in a thriving village between 82nd and 89th Streets. In 1857 the city erased it.
Behind an ordinary office entrance at 233 Broadway hides one of the most spectacular interiors in America — a neo-Gothic lobby of marble, mosaic, and bronze, open only on guided tours.
Off the Bronx shore sits an island where New York has buried its unclaimed dead since 1869 — around a million people, on land the public couldn't set foot on for 150 years. Hart Island served as the city's potter's field, closed to the public for over 150 years before limited guided visits began.
Constructed by the Long Island Rail Road to prevent locomotive accidents on busy streets, this 1,600-foot cut-and-cover brick vault was rediscovered by Bob Diamond in 1980.
Behind the darkened, tinted windows of this historic 1847 Brooklyn Heights residence lies no parlor or staircase—only a roaring MTA subway emergency exit and ventilation fan.
Conceived in the 1930s by John D. Rockefeller Jr. and Raymond Hood, this pioneering underground concourse allows pedestrians to traverse Midtown Manhattan out of the rain and snow.
Tucked between Hudson and Jay Streets, this cast-iron and brick skybridge overhead was built in 1907 to link the House of Relief to a hospital annex.