A modern zoetrope on the New York City subway.

The painter who popularized "bulls" and "bears" as symbols for the stock market didn't get a proper headstone for over a century.

A curious friendship between two inanimate ladies.

A Victorian cemetery in the heart of Brooklyn remains a popular mecca of morbid curiosity.

The first piece of public art dedicated to LGBT rights.

Civil War-era Fort designed to withstand invasion and attack, with tricky traps called "murder holes."

Civil War Fort on an island in the Boston Harbor.

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

This bridge was the birthplace of a unit of measurement based on a fraternity joke.

Louisa May Alcott based “Little Women” on her experiences growing up in this house with her sisters.

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

Since 1947, this living history museum has been providing an immersive look at life in Plymouth Colony.

In 1958, an MIT fraternity pledge laid down on this bridge and instituted a new, unique unit of measurement.

Utopia and nostalgia mingle at the site of Bronson Alcott's ill-fated agrarian commune.

The oldest continuously-operated inn in the United States, once owned by Henry Ford.

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

A simple but powerful tribute to the 20 victims of the 1692 witch trials.

A luxury hotel constructed out of a former jail.

A three-piece musical sculpture installed between the subway tracks at Kendall Station near MIT.

One of the last remaining movie theatres in the country that features a rear-projection system.

Kwanu'sila the Thunderbird has been silently watching over Chicago for more than 100 years (kind of).

A spectacular remnant of an Adler and Sullivan masterpiece that was destroyed in 1972.

A 400-foot-tall tall map of Chicago makes this once-ignored building stand out.

This $3 million model train takes you through Chicago, Seattle, and the thousands of miles in between.