Unrepaired walls from a 1920 anarchist bomb attack.

This cemetery has graves dating back to the 17th century, including the city's oldest carved tombstone and an ominous cryptogram.

This Wall Street bar was once a hub of revolutionary activity where Washington famously bid farewell to his troops.

Curious crustaceans support an obelisk from ancient Egypt that now stands in modern-day Central Park.

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

Historic Hull Street was actually the first street with a proper name in the Boston area.

Stolen goods adorn the organ at Old North Church.

Narrowest house in Boston.

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

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

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

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

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

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

The tomb of Increase Mather and his son Cotton, influential colonial ministers obsessed with the occult.

This family mausoleum is steeped in symbolism and looks more like a fantasy location than a grave.

This historic Victorian hotel has a scandalous history of affairs and murder.

Experience a charming 1930s version of "infotainment."

The bullet-riddled wall from the St. Valentine's Day Massacre, bloodstains enhanced for your viewing pleasure.

Semi-recognized center of the world, with many oddities.

Walk through the actual strap iron cells and solitary chambers of Arizona Territory’s first prison.

The world's largest military aircraft cemetery.

America's only nuclear missile silo open to the public.

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