A plaque on the side of a parking garage marks the burial place of a great Ottawa chief.

The Old Courthouse takes visitors on a captivating trip through St. Louis' timeline.

A creepy sculpture of a decapitated head invites viewers to see St. Louis through its empty eyes.

This Asian-inspired tower in a lush urban park provides spectacular panoramic views of Baltimore.

This grove was planted more than a century ago by the War Mothers of World War I.

Wedged between two sets of row houses is an awkwardly located family graveyard.

Once a thriving business district, this former shopping area is now an urban ghost town in the heart of the city.

A faded sign from the 1920s remembers Baltimore's resistance toward banning alcohol.

Once part of a dam servicing an early 19th century grist mill, the tucked-way falls are a tricky-to-find urban oasis.

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

An old pay phone rewired to play local bird calls and songs at the press of a button.

This propitious plastic porcine has been petitioning park visitors to pick up after themselves for more than 50 years.

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

These five Art Deco homes were meant to solve the "small house problem."

Giant acorn-shaped 19th century gazebo from which suburban Washingtonians gazed upon the original "silver" spring.

A tribute to the beloved, kind-hearted "homeless mayor" of Silver Spring.

Literal "money laundering."

This house was once the location of Frelinghuysen University.

This rowhouse doubles as one of the most photographed spots in the nation's capital.

A brass and marble scale model of the solar system embedded in the concrete.

The former home of the woman who successfully fought to integrate restaurants in Washington, D.C.

Outside the Department of Transportation, a collection of artifacts honors the history of how we get around.

Through the decades, Black music stars have performed at this historic hub for music and the arts.

A haunting tribute to pioneering photographer Clover Adams.