The childhood home of the Sultan of Swat is just a line drive away from Oriole Park at Camden Yards.

A winding district gerrymandered into the shape of a mantis.

FDR's Art Deco hospital tower was hopelessly inefficient.

This rare triple-jurisdiction drawbridge passes through Virginia, Maryland, and Washington, D.C.

Proto-CIA agents trained with grenades in the sand traps and fired machine guns from the fairways.

An isolated island home to one of the oldest English-speaking communities in the region and Maryland's state dessert.

The bridge's highly-contested plaque (once again) honors Confederate President Jefferson Davis.

A relic of FDR's brief foray into utopian urban planning.

This massive swimming pool is the high tech home to the human-powered submarine races.

Home of the physician who set the leg of John Wilkes Booth after the Lincoln assassination.

The world's oldest continuously operating airport was founded by the Wright Brothers.

A lawn full of retired spacecraft on display at one of NASA's first research labs.

The stone marker that Mason and Dixon placed at the eastern end of the famous north-south border they surveyed.

The Forest Service's surprisingly sophisticated collection of wildfire prevention art features America's most beloved bear.

Rediscovered after a century, the father of the American Navy was reinterred in something dredged up from Davy Jones' Locker.

This fort down the Potomac from Washington, D.C. was once the only defensive fort protecting the capital.

This scenic Maryland park was the site of one of the worst prison camps of the Civil War.

This bug-eyed water wheel uses the power of the Sun to clean up Baltimore Harbor.

Captain John Smith thought these cliffs were amazing in 1608 but sharks thought so 20 million years before him.

The longest escalator in the Western Hemisphere takes over three minutes to ride down.

The land is home to swimming ponies and a legendary 18th-century treasure.

A local farm's collection of unusual structures from a now defunct storybook amusement park.

A priceless collection of the Nation's cryptologic history.

An astounding collection of medical specimens, including bits of President Lincoln.