A curious building honoring past and current members of a historic musical comedy troupe.

One of the oldest of its kind.

One of Philadelphia's largest murals resides hidden under this bridge.

Hidden behind West Philadelphia rowhomes is a haven for migratory and local bird species both ordinary and rare.

Alexander Hamilton’s creation caused quite a bit of controversy.

This elaborate towering structure was once famed for its revolutionary height.

In the early 1800s, surgery was also a show.

Huge masonic hall in Philadelphia with lavishly themed rooms.

The abandoned coal loading dock is a canvas for unsanctioned art.

One artist's love letter to his city and its citizens plays out across dozens of bright murals painted on the sides of decrepit buildings.

This little-known collection holds everything from "Dracula" notes, to the manuscript of "Ulysses," to the forged works of Shakespeare.

The taxidermied remains of Charles Dickens' pet raven, which helped inspire one of Edgar Allan Poe's most famous poems.

This charming colonial alleyway is one of the oldest continuously used residential streets in the U.S.

A beautiful and abandoned New York subway station from 1904, complete with chandelier.

Tour the dark and beloved poet's former cobwebbed basement, which may have inspired "The Black Cat."

A layered tribute to the work of mosaicist Isaiah Zagar.

An abandoned cemetery lies in ruins as the surrounding forest swallows it whole.

A former insane asylum despised by Nelly Bly and Charles Dickens is now fashionable apartments.

Hidden in one of New York's oldest subway stations is the final remnant of the site of the bizarre Shakespeare Riots.

Here, exhibits come with a side of edible history.

The world's largest collection of materials relating to lesbian history is housed in a Brooklyn townhouse.

A hidden "place of interment for gentlemen."

Those belting out show tunes might not realize this piano bar marks the site where Thomas Paine died in 1809.

Hear the tales of New York's most notorious criminals.