This hidden treasure provides a charming access point along the south side of Baker Park.

Using a massive antenna made up of five miles of wire, two scientists tuned into organic radio waves from the planet Jupiter.

The "Sultan of Swat" once attended a school at the site of this baseball field.

Dating to 1793, this is the oldest building in Poolesville.

This statue honors the author's groundbreaking family story.

Just outside the Naval Academy, Hell Point is a historical marker that could easily be the point where failed students wait for the bus.

One of the earliest and best-preserved buildings in Charles County, Maryland.

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

The smallest covered bridge in Maryland.

Washed out by the Johnstown Flood in 1889, the surviving portion of the original two-span bridge now resides at Fishing Creek.

A total of 14 men held the title of "president" before George Washington—their historical legacies are enshrined in the lobby of a hotel.

A state park that once served as an important river crossing, and now offers protected lands for endangered plants and animals.

The Decoy Capital of the World.

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

This lovely tree was a thank you gift from the man known as "Public Enemy No.1."

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

The 72-foot giant escaped confinement in a large patch of mulch only to be reburied in the sandy shores of the Potomac River.

A swimming hole in the historic industrial quarry that supplied the marble for the Baltimore Washington Monument.

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

This historic lighthouse was well known for the large number of women who served as its keeper.

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

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

A mammoth pair of Civil War artillery guns abandoned out in the forest.

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