The most decorated dog of World War I is preserved in the Smithsonian.

What was once a true peninsula has now been filled in, causing the water to recede and leaving many streetside "waterfronts" and landlocked "islands."

Stolen goods adorn the organ at Old North Church.

This area was once known for being a lawless haven for rough-and-tumble sailors, earning the maritime-themed nickname "the black sea."

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

America's original house of worship for Spiritualism, the religious movement based on communing with the dead.

American revolutionaries and British soldiers alike are buried here in the fourth-ever cemetery in Boston.

The oldest working bell set in North America, the bells at Old North Church sat silent for their first four years in Massachusetts.

Mrs. Mallard and her brood are a beloved fixture in Boston Public Garden.

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

The site where Charles Dickens gave his first public reading of "A Christmas Carol" in the US.

An easy-to-miss garden in Boston's North End honors the mother of JFK and others who lost children in WWII.

On a former island, this old fortification once used to protect the Boston Area and started Edgar Allan Poe in his military career.

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

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

One of the now-less-hidden floral gems of the "Emerald Necklace."

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

One of America's most historic homes also holds a startling literary legacy.

Ancient pueblos built into the base of a natural canyon wall.

This Yellowstone geyser may not shoot as high as the nearby Old Faithful, but it erupts for considerably longer.

The fastest mail service in the west is tracked and memorialized along this 1,400 mile trail.

The house where the famed outlaw was shot by a dirty coward is now a museum to the criminal's legacy.

Once an ambitious nature spa, these forest ruins now provide a serene monument to failure.

Erosion and time have created a naturally-formed water park.