The curious underground history of keeping Paris clean.

Indents in the pavement are all that remain from a grisly death machine in Paris.

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

The vast, legendary catacombs hold secrets much stranger than stacked bones.

This statue intended for children to enjoy became a minor political spat.

Dedicated to one of the darkest moments in Irish history.

This impressive Boston holy house is the American mecca for Christian scientists.

Millions of numbers carved in glass represent the tattoos forced upon victims.

An interesting decoration on this historic site, this weathervane comes with as many legends as it does questions.

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

Silverware in the sidewalk outside a grocery store cements this neighborhood’s Italian culinary history.

A mysterious stone embedded at the base of a historic Boston building.

This monument on Breed's Hill proves that one of the most famous battles of the Revolutionary War is misnamed.

This nearly 200-year-old restaurant's history includes an exiled French prince, JFK, and a very hungry Daniel Webster.

Narrowest house in Boston.

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

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.

What is the Thing?

Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

The Denver airport is guarded by a 32-foot-tall sculpture of a demonic horse.

The California capital city once stood 10 feet lower than it does today.