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

A unique columnar residence built in the 19th century.

This massive World War II calculator hearkens back to the days when "computer" was a job title.

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

Berthed at the Charlestown Navy Yard in Boston, "Old Ironsides" is the oldest commissioned warship still afloat.

This peaceful Massachusetts graveyard was one of the first "garden-style" cemeteries in America.

An old trolley bridge was converted into a breathtaking garden bursting with colorful flowers.

This tiny, painted door at the base of a tree stump has been a fixture of the Harvard University campus for decades.

"the sweltering inhabitants of Charleston and New Orleans, of Madras and Bombay and Calcutta, drink at my well . . . The pure Walden water is mingled with the sacred water of the Ganges."

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

Museum dedicated to awful artwork.

Washington's iconic carousel has a nice piece of Civil Rights history.

Members of Congress have traveled between the buildings on Capitol Hill for a century hidden from tourists, press, and storm clouds.

The remains of Martha, the last known passenger pigeon, serve as a tool to educate about conservation.

The actual model from the original "Star Trek" series is now on display at the National Air and Space Museum.

After the parade, students throw their beads on the tree hoping for good luck on exams.

Formerly known as National D-Day Museum, this collection commemorates the battles of Normandy and WWII.

In 2010, Nicolas Cage purchased two plots in this cemetery using one to construct this strange pyramid mausoleum.

The oldest cemetery in New Orleans, resting peacefully for over 200 years now.

The second oldest continuously operating bar in Louisiana.

The final resting place of New Orleans' most famous voodoo priestess.

The handiwork of a underdog clockmaker who solved an impossible problem for an Empire, and forever revolutionized seafaring.

The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

Richard III supposedly disposed of his nephews' bodies here in an effort to seal his claim to the throne.