The only arched bridge made of stone on the entire Mississippi River.

This old residential building was once the largest flour mill in the world.

This beloved marketplace mascot poops money and grants good luck.

This elaborate towering structure was once famed for its revolutionary height.

Near the ruins of a Civil War coastal fortress lies the only known African refugee cemetery in the United States.

Once decrepit and slated for demolition, now one of the longest pedestrian bridges in the world.

This historic train station has been converted to a locomotive themed hotel.

This funicular railway rumbles along for a mile up the nearly vertical face of Chattanooga’s Lookout Mountain.

The mysterious wonder of an underground waterfall is illuminated by multicolored lights.

Just below the surface, shrimp are producing temperatures hotter than the sun.

The arboretum whose marshy soil sucked up the dreams of housing developers.

Memorial to a beloved puppeteer as well as all street performers.

Dedicated to one of the darkest moments in Irish history, this memorial has faced its fair share of backlash.

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

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

This monument on Breed's Hill proves that one of the most famous battles of the Revolutionary War is misnamed.

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

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.

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

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

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

A historic beacon built in the aftermath of the worst maritime disaster on the Great Lakes.