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

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

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

A crumbling hospital from the 1850s on Roosevelt Island.

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

La Monte Young and Marian Zazeela's "Dream House" will immerse you in an ever changing world of sound and light.

A terrific purveyor of natural history objects and curios.

The best way to get a sneak peek at the movies.

A museum collection honoring the long history of the FDNY is held in a disused Manhattan fire house.

This controversial, abstract sculpture is meant to represent an Aztec warrior.

An art installation commemorates journalist Nellie Bly's undercover reporting inside a New York asylum.

Dishes are packed with flavor at one of the only Singaporean restaurants in Paris.

Peruse produce from Senegal, Cameroon, and other West African nations at this sprawling market.

Head to this repurposed Renault van for fiery sausages and fries.

Travel back in time at a Moroccan-inspired restaurant that was the height of glamor in the 1970s.

Offal and flawless onion soup are on the menu at this restaurant that once catered to the workers of Les Halles.

This Algerian sweet shop serves confections in an eye-popping array of hues.

Shop at the 200-year-old store where Julia Child stocked up on copper cookware.

The video game-themed street art first popped up in the French city.

The final resting place of the "father of special effects."

A glamorous hotel that once accommodated French resistance fighters and concentration camp survivors.

A museum dedicated to linguistics, from how babies learn to talk to endangered and extinct languages.

This mural painted by Keith Haring was done without payment as a gift to entertain the children at the Hôpital Necker.

A museum dedicated to one of Paris’s most famous residents, tucked into a corner of one of the city’s most famous squares.