Berthed at the Charlestown Navy Yard in Boston, "Old Ironsides" is the oldest commissioned warship still afloat.

The site of Paul Revere's historic two lantern warning.

The American Revolution was galvanized into serious action due to the tragic clash with British soldiers that occurred at this location.

The site of one of the strangest disasters in history—a wave of deadly molasses traveling at 35 mph.

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

A morbid secret lies hidden within the beautiful walls of the Boston Athenaeum.

This Boston medical museum features the skull of the famous medical case of Phineas Gage.

A simple plaque on the facade is the only reminder that the treaty ending the American Revolution was signed inside.

An effigy of a trapped paratrooper dangles from a Normandy church to commemorate one remarkable D-Day event.

Home to the "Rat King" of Nantes and other wonders of the natural world.

This bridge was constructed from the rubble of the infamous Bastille.

Statue of a decomposing prince that once held his heart in its hand.

The spiral staircase hidden inside this giant Parisian column was likely built for Catherine de Medici's astrologer.

One woman's decades-long obsession with the "La Fée Verte."

Dedicated to the art of hunting, with juxtapositions of contemporary art.

An antique curios dealer and hybrid taxidermist.

The famous winding walk at Chartres is surrounded in mystery and myth.

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

Ancient paintings known as the "Sistine Chapel of Cave Art."

Science fiction's grandfather has a fittingly marvelous tomb.

This statue was given to France by the United States to commemorate the centennial of the French Revolution.

A majestic lion statue guards this Parisian botanical garden, and feeds on an unsettling item.

This museum houses an imposing skeleton army comprised of creatures great and small.

Known as the "Dodo Manège," this carousel features a herd of animals that have disappeared—or may be gone soon.