A superbly preserved example of Georgian residential architecture that was once home to one of the founders of Alexandria, Virginia.

This lovely picnic spot featuring thunderous jet landings is an aircraft spotter’s dream.

This brick-lined pedestrian walkway was once a railway tunnel used during the Civil War.

There must be a pun in this haystack somewhere...

The only home that Alexander Hamilton ever owned has a history almost as troubled as his own.

The one-stop shop for all of your superhero (or evil arch-nemesis) needs.

The meeting of the northwestern corner of Delaware, the northeastern corner of Maryland, and the southern edge of Pennsylvania.

These lush botanical gardens employ the most purrfect pest control force.

The sounds of the world's largest fully functioning pipe organ dazzle shoppers at a Philadelphia Macy's.

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

The residents of the Neighborhood of Make-Believe live without much fanfare within the Pittsburgh Children's Museum.

This might just be the TARDIS of bookstores.

Yo, Adrian!

A unique sculpture park that specializes in the huge and bizarre.

A focal point of in Denver’s skyline for over a century, inspired by a Venetian basilica.

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

A sacred site for Native Americans surveyed by George Washington and owned by both King George III and Thomas Jefferson.

America's Most Wanted's set resides in this tribute to the history of crime and punishment.

This statue of one of baseball’s greatest pitchers looks like something out of a sci-fi horror movie.

The National Park Service’s best-kept secret with views that rival any in D.C.

This seemingly out-of-place gas station by the Watergate hotel was once described as the most expensive gas station in the world.

A muscular Art Deco monument represents the struggle between regulators and unbridled markets.

An overlooked memorial honoring the local Washington residents who died in World War I.

The little-known, 300-year history of the area includes former lives as a bustling tobacco port, parking lot, and industrial dump.