North America's oldest quarantine facility was built in response to Philadelphia's 1793 yellow fever outbreak.

Visit a fourth-generation farm and museum dedicated to everyone's favorite fungi.

This collection of odd proofs of concept is like taking a walk through the imagination of a Victorian engineer.

One of the oldest log cabins in America is one of the last of its kind this historic Swedish dwelling remains a piece of living history.

A wonderfully curated used bookstore in an airport.

The bugs crawling down the front of this office building are almost as big as a '68 VW Beetle.

A unique botanical garden housed in three giant geodesic domes.

Built in France in the 1400s, this gothic chapel now resides at Marquette University in Milwaukee, Wisconsin.

This giant, rotating globe was built to celebrate the expansion of a company that makes steam cleaners and pressure washers.

In the parking lot of a fast food restaurant, a statue memorializing a prolific bull elephant.

According to local history, this cast-iron canine was nearly melted down for bullets during the Civil War.

This four-story steel sphere in Maryland was used to test biological weapons.

Historic barracks utilized during both the Revolutionary War and the Civil War.

Rumors persist that a bottle of whiskey is sealed within this Demijohn-shaped adornment.

First built around 1848, this bridge was destroyed by arson, but original timbers are included in the replacement.

Built by the patriotic residents of Boonsboro in a single day.

The last holdout of a pre-Civil War rebel who took the matter of slavery into his own hands.

This striking Victorian Home with its 113-foot turret is best known as the site where abolitionist John Brown was executed in 1859.

True to its name, this little house presents like a dollhouse, and surprising details are revealed with a quick peek through the window.

Once the home of a noted Civil War spy, the two-story brick house now serves as a museum.

Despite violent work crews and massive delays this abandoned canal tunnel was built to last into the modern day.

The first blast furnace in the United States that used coal and coke fuel instead of charcoal to make pig iron.

This one-room cabin where the young colonel slept during the French and Indian War.

Maryland's first (and last standing) toll house on America's first federal road established the state as the "Gateway to the West."