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

Though its celestial ceiling is impressive, the true star is the vast collection of French books.

A pedestrian island in the middle of world-famous Times Square emits a strange (and purposeful) humming noise.

The 28-foot granite map plots the locations of 40 theaters in New York City.

Step inside Lucy, the world's largest "elephant."

Where the embers of the Big Bang were first detected.

One of the oldest standing structures in Montgomery County, Maryland.

This robust fence in front of a historic Georgetown home is likely made from hundreds of recycled Revolutionary War firearms.

People escaping slavery may have hidden inside a corpse vault.

More gold than anywhere else, ever.

A 300-year-old tea shop that brought tea to the English people, not to mention the Queen herself.

An abandoned railroad tunnel is now filled with bioluminescent bugs.

NASA's leading space science lab started by a co-founder with deep ties to the occult.

Led Zeppelin wrote some of their most iconic songs at this little 18th-century Welsh cottage.

Over 100 concrete munitions bunkers are all that remain of a Pennsylvanian village seized by the US government.

This medieval mountain town is also known as the "Village of Streams."

Monty Python fans will recognize this abandoned mine as the Cave of the Killer Rabbit of Caerbannog.

Dating to 1793, this is the oldest building in Poolesville.

A plaque memorializes the Boston location of one of the largest nightclub fires in history.

The history of the tea trade is told in bas-relief on this historic pair of Boston doors.

Funded entirely by volunteers and donors this military memorial features a tank with a comedy line on its barrel.

The right to a full beard is honored by the grave of a man who was attacked and jailed due to his facial hair.

Built in 1815, the stabilized ruins of the grist mill and sawmill are now gated, but interpretive displays on the features and functions of the mill preserve its history.

A detached cement mixer has been transformed to resemble a relic from some obscure NASA mission to Oklahoma.