The world’s oldest and biggest bookstore stocking only mystery, crime fiction, espionage, and thrillers.

Elevated freight railway turned wildly successful urban park.

The oldest family-run luncheonette in New York, last renovated in 1948, still serves food and drinks the old-fashioned way.

Amid the bustle and noise of the Financial District hides a secluded garden oasis above the city streets.

This abandoned subway station beneath the Waldorf-Astoria hotel is allegedly used to secretly transport presidents.

Manhattan’s Battery Park has a whimsical carousel full of spinning, glowing fish.

A tiny museum housed in a New York freight elevator specializes in the "overlooked, dismissed, or ignored."

A treasure trove of artifacts, books, and artwork from the "golden age" of exploration.

A beautiful and abandoned New York subway station from 1904, complete with chandelier.

A terrific purveyor of natural history objects and curios.

A crumbling hospital from the 1850s on Roosevelt Island.

This beautiful architectural gem was the first waste treatment facility in Boston.

A former waterfront market is now in the center of town due to some interesting Boston engineering.

On a former island, this old fortification once used to protect the Boston Area and started Edgar Allan Poe in his military career.

One of the last remaining World War II Victory Gardens in the U.S. is quietly growing across from Fenway Park.

The massive machine creates cracking displays of indoor lightning.

"Mock all and sundry things, but leave the saints alone."

The former locus of Boston's high culture has been shuttered and buried for over 70 years.

The bears may be gone, but their old cages can still be found.

This landmark cemetery in Boston was created more than 300 years ago.

Site of a famous 19th-century transcendentalist utopian community, now abandoned.

Ralph Waldo Emerson spent two years living here decades before it became a Frederick Law Olmsted-designed park.

One of the now-less-hidden floral gems of the "Emerald Necklace."

Macabre headstones carved with winged skulls, dancing skeletons, and pithy reminders of impending death.