Hundreds of drawings left by the land's previous inhabitants remain mysterious.

A well-preserved example from a 1920s network of airmail navigation arrows sits near Interstate 15 in southern Nevada.

Inside the Wayne County airport is an amazing collection of lights and sounds.

A secret hatch containing two parchments was discovered in this statue over 40 years after its installation.

It appears as if a man is standing behind this giant airport clock, painting the hands in real time.

A derelict bit of infrastructure from the canal that once ran through D.C. is landlocked in the heart of the city.

The monument's pointy aluminum tip has been melted down by repeated lightning strikes.

Look closely and you’ll notice that the color changes a third of the way up the tower.

The story behind this beloved toy—named for Theodore Roosevelt and owned by his grandson—is more complicated than you might guess.

This taxidermy horse was a Civil War hero.

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

Washington's iconic carousel has a nice piece of Civil Rights history.

Home to items never before seen by the public.

Two insane asylum bodies embalmed by an amateur.

A sculpture serving as an homage to Pope John Paul II.

The famous sculptor left his mark on this Italian wall in an internationally protected example of street art.

Two stone columns flank the grand Venice square, but there were supposed to be three.

Venice's island of the dead.

This community on a small Venetian island has taken to painting their houses in bright neon hues.

Go inside to really appreciate this 500-year-old technological masterpiece.

This rare female version of the Muffler Man has its clothes removed each summer to signal the start of pool season.

A three-piece musical sculpture installed between the subway tracks at Kendall Station near MIT.

What was once a true peninsula has now been filled in, causing the water to recede and leaving many streetside "waterfronts" and landlocked "islands."

An easy-to-miss garden in Boston's North End honors the mother of JFK and others who lost children in WWII.