This alley in downtown Chicago held the bodies of over 600 people after the fateful Iroquois Theatre fire.

This historic hotel invented the chocolate brownie.

This massive stained-glass masterpiece is thought to be the largest Tiffany dome in existence.

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

A gorgeous mural outside a beloved D.C. restaurant pays homage to famous Black Americans.

Those with a sharp eye can find the hidden image of a German Shepherd on the memorial's Mural Wall.

Largest Roman Catholic church in North America.

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

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

One artist’s scheme to expand museum viewing hours into the evening led to the illumination of an entire city.

Baltimore's classic clock tower was once topped by a rotating, 20-ton medicine bottle.

The likeness of the Baltimore music icon was unveiled in time for the anniversary of his Senate hearings on music censorship.

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

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

A blank headstone topped with a pile of pennies marks the final resting place of the infamous assassin.

A 200-year-old bar with a cheeky name claims to have served Edgar Allan Poe his final drink.

A hidden alley in urban Baltimore is a haven for graffiti artists.

This beloved Baltimore spot features caged dolls, a giant Pez collection, and many, many mannequins.

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

These pretty kitties killed and ate as many as 135 railway workers.

Four glass boxes hover over 1,000 feet in the air to give visitors an unparalleled view of Chicago.

The fastest mail service in the west is tracked and memorialized along this 1,400 mile trail.

The house where the famed outlaw was shot by a dirty coward is now a museum to the criminal's legacy.

The first car-centric shopping plaza in the U.S. brought a little bit of Spain to downtown Kansas City.