The haunting "Hell House Altar" is one of the few remnants of an abandoned college that has been a magnet for local legends.

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

This abandoned Victorian-style house was built in 1884.

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

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

The man who first patented the Ouija board rests in peace beneath a headstone that playfully reflects that achievement.

This forgotten boat elevator was an engineering marvel in its heyday.

A derelict bit of transportation infrastructure hidden in the woods.

A painfully obvious spy house sits right across the street from the Russian Embassy.

There's a 12-foot-tall replica of the Washington Monument hidden under a manhole nearby.

A historic neighborhood church is reborn as a psychedelic arts collective.

Long-abandoned trolley tunnels just a mile away from the White House are turning into an art space.

The last masonry skyscraper ever built reveals a transitional moment in architectural history.

Not to be confused with the iconic New York City skyscraper, this Chicago building is a vibrant hub for artists.

In a quiet north Chicago neighborhood rests a stunning relic of the golden age of earthenware design.

The beloved home to all publications indie, erotic, and punky.

A gothic church spire sits atop this skyscraper, the tallest church in the world.

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

This shop for all your super spy needs hides an educational secret.

This whimsical Oz-themed park had a wonderful impact on the surrounding neighborhood.

A haunting statue called "Eternal Silence" has quite the reputation among visitors with active imaginations.

This unauthorized stone mermaid was secretly carved out of public stone before being permanently preserved.

A Bibliophile's Dream.

A lush green oasis in the middle of Chicago.