The spot in the Mile-High City that's exactly 5,280 feet above sea level (at least for now).

This sidewalk tribute honors Colorado's great culinary creation.

A small horde of mythical creatures lurk almost imperceptibly within the museum's wildlife dioramas.

A small store filled with animal skulls and other curiosities.

The Denver airport is guarded by a 32-foot-tall sculpture of a demonic horse.

Creaky dinosaurs grow in the backroads of Monmouth County, New Jersey.

The first dish to bounce radio signals off the Moon, it was the forerunner to the U.S. Space Program.

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

A former waterfront market is now in the center of town due to some interesting Boston engineering.

Silverware in the sidewalk outside a grocery store cements this neighborhood’s Italian culinary history.

The world's largest piece of copyrighted artwork.

From economic backbone of a community to deadly diving hole, these former stone quarries are now a park for rock climbers and graffiti artists.

The ruins of one of the first railroads in the U.S. lie hidden within a neighborhood cul-de-sac.

This small shop walked so America could run on Dunkin'.

Dedicated to one of the darkest moments in Irish history.

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

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

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

This nearly 200-year-old restaurant's history includes an exiled French prince, JFK, and a very hungry Daniel Webster.

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

This popular Boston haunt is reminiscent of a time gone by, when slow cafes and sweet-smelling smoke wafting from patios was the norm.

One of the oldest used bookstores in the U.S. has been selling antiquarian treasures since 1825.

The former site of an all-but-forgotten colonial landmark is now remembered by an often overlooked bas relief.

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