A tiny piece of the Moon is embedded in this stained glass masterpiece.

A heroic pigeon that, through a barrage of gunfire, delivered a message that saved over 100 lives in World War I.

The most decorated dog of World War I is preserved in the Smithsonian.

It's not hard to see why the historic Peabody Conservatory of Music's library has been described as a "cathedral of books."

Crammed into a Baltimore row house is an oddities shop that sells everything from skulls to dead insects.

The design of this historic domed church was influenced by Thomas Jefferson and intended as a statement of religious freedom.

This simple convenience store sits on the location where the Ouija board was named—and has a plaque to prove it.

The site where Poe "in great distress, and ... in need of immediate assistance" likely died.

Once America's tallest structure, now a Baltimore landmark.

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

Remnants of a storybook amusement park hidden behind a strip mall.

A historic arena where the Beatles played their first concert in the U.S.

A benevolent, 16-foot-tall river dragon lives on a suburban lawn.

A Civil War fort in the middle of Washington, D.C. has been swallowed by a forest.

The only Civil War battle in Washington D.C. took place near this highest natural point in the city.

An obscure federal monument honors the French diplomat who served as Ambassador to the U.S. during WWI.

Tiny observatory made big contributions to the study of the Earth's motion.

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

Berkeley Hot Springs presents to you "the only outdoor monument to presidential bathing."

A star fort along the C&O Canal in western Maryland that protected America in three wars.

A monument marks the location of the first successful steamboat demonstration.

A cave on the Maryland border where civilians took refuge during the bloodiest battle of the Civil War.

A pre-Industrial Age iron furnace and the site of a nearly-forgotten piece of Black history.

The beloved statue at the National Academy of Sciences is oh so inviting to sit on.