Two thousand artifacts from around the world collected by one woman who loved to travel.

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

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

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

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

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

This massive tea kettle was once a promotional stunt for the Oriental Teashop.

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

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

This funeral home had the honor, if that is the correct word, of hosting the funeral of the famous Sacco and Vanzetti.

The oldest playground in America.

On the Fourth of July this area will transform into a Pompeii-like storm of falling embers and ash.

D.C. once had its own tiny rival to the New York Stock Exchange.

This scenic Maryland park was the site of one of the worst prison camps of the Civil War.

The oldest continuously operating fish market in the United States.

The rooster who crossed the road lives on forever in Takoma Park, Maryland.

The stone marker that Mason and Dixon placed at the eastern end of the famous north-south border they surveyed.

The little-known, 300-year history of the area includes former lives as a bustling tobacco port, parking lot, and industrial dump.

An Industrial Revolution-era public work that purified water using nothing but sand.

When it comes to handsignals (and colonialism) rock always beats scissors.

The Pentagon sits on a former island that was in Virginia at low tide and D.C. at high tide.

Historic home of America's sweetheart sharpshooter, Annie Oakley.

This dig site outside D.C. is known for its exceptionally high density of baby dinosaur fossils and dinosaur eggs.

Tiny observatory made big contributions to the study of the Earth's motion.