Stripes of human ashes cover a back lawn in the most sought-after burial grounds in Paris.

Dedicated to the history and culture of smoking, this small museum now includes a vape lounge.

Walk through spectacular aisles of hanging meat and wagon wheel–sized cheese at the world's largest wholesale food market.

The narrowest street in Paris.

The Argonaute submarine was the French navy's pride and joy in the 1950's.

Despite being considered a thoroughly American sport, basketball's oldest surviving playing field is found in the basement of a Paris YMCA.

An iconic and eccentric bar for "Manouche" Jazz music keeps expanding its space—and its influence.

135 bronze medallions mark a French meridian line which once rivaled the hotshot Greenwich timeline.

This banal Parisian entranceway is not what it seems.

The subterranean "lake" below the Paris opera house inspired the Phantom of the Opera's lair.

The curious underground history of keeping Paris clean.

An overlooked marble is the only surviving in-place 18th century example of the measurement that changed how we define distance.

The history of radiation is on safe display at the foot of a radiation science laboratory.

A subterranean shelter remains intact under a busy Paris railway station.

The very center of Paris is surrounded by a bevy of strange good luck rituals.

One of the oldest medical collections in Europe focusing on rare surgical instruments.

This charming cobbled backstreet is the most Instagramable street in Paris, much to the residents' annoyance.

There's a piece of New York City transportation history hidden in plain sight at a Manhattan subway stop.

This tiny store is your one-stop shop for all sorts of rare and wonderful buttons.

The saddest little diner in New York.

A museum devoted to bringing to light forgotten or neglected histories through exhibitions, education and public programming.

Walk over a 150 year old manhole.

Tucked in the back of this amazing antique store is an important piece of medical history.

The rare American Civil War-era weapon was never fired in anger.