A whimsical village of unique treehouses resides in a Washington forest.

A museum dedicated to the history and exploration of both popular music and science fiction.

America’s oldest community theater, this Boston club has been in operation since 1877.

No one messes with the Massachusetts sacred cod, not this time...

Beautiful steampunk ghosts of early Massachusetts.

The final residence of an educator, civil rights leader, and presidential advisor was also the first headquarters of the National Council of Negro Women.

This unassuming passageway played a key role in one of the most important events in U.S. history.

The preamble to the U.S. Constitution written entirely from vanity license plates hangs in the Smithsonian museum.

The "lovely red Vega" of the legendary record-settling pilot.

Housing the National Women's Party since 1929, this historic house is now a monument to the fight for gender equality.

Perhaps the most scandalous statue of America's first president.

During the Industrial Revolution this “Temple of Invention” was full of intricate miniature machines and gadgets.

A museum cafe showcases Native American dishes and indigenous ingredients from across the Western Hemisphere.

Out of a labyrinth of abandoned tunnels and stops, this Queens subway station is arguably the most mysterious—if it exists at all.

A New York warehouse filled with an enormous amount of goods saved from the landfills and donated for creative use.

Piano-making empire filled with 200-year-old steam machines still churning out 1,000 instruments a year.

An exhibition space dedicated to American outsider art created between the 18th and 21st centuries.

The remnants of two World's Fairs are here, complete with a 12-story globe, a mini-Manhattan, and a UFO-shaped pavilion.

A Hell's Kitchen synagogue that has counted stars of stage and screen among its congregation.

From this desk Al Hirschfeld drew his influential caricatures of the 20th century's Broadway stars.

The only remaining building in New York to see the inauguration of a president is being slowly overtaken by a grocery store.

Depression-era fun lives on in this Harlem museum dedicated to the sport of the street.

This humble historic facade hides a history of boozing and the gentlemanly sport of rat-fighting.

A famous songsmith's custom piano, dubbed "High Society," is hidden just out of sight in one of New York's finest hotels.