Island where motor vehicles are banned -- home to the only carless highway in the United States.

The graveyard holding the remains of George Washington's slaves was forgotten for nearly 200 years.

This stately building in Alexandria, Virginia was built by Freemasons to honor one of their most famous members.

The 5.5-mile ring of steel posts around the Capitol Building is one of the largest (and most uniform) of its kind in the world.

This statue of one of baseball’s greatest pitchers looks like something out of a sci-fi horror movie.

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

A bas relief commemorates the "Nuns of the Battlefield" who cared for soldiers on both sides of the conflict.

Those with a sharp eye can find the hidden image of a German Shepherd on the memorial's Mural Wall.

This imposing Masonic temple a mile from the White House was the first public library in Washington, D.C.

Largest Roman Catholic church in North America.

The national park was once a plantation estate.

The beloved statue at the National Academy of Sciences is oh so inviting to sit on.

These millennia-old murals once covered the walls of residential complexes across the ancient city.

A beautiful example of 18th-century engineering still standing tall.

The F1 Mexican Grand Prix circuit goes right through the middle of this old baseball stadium.

Historic poems about the noble act of defecating have been preserved on the wall of this old convent.

This pre-Hispanic apartment complex also includes ancestral paintings that point to its military past.

Dating back to the second century, vestiges of prehispanic mural paintings are found in this underground palace.

This sculpture garden is a serene oasis wedged in the middle of a busy highway.

The extremely grey columns of one of Mexico City's most iconic beltways are slowly gaining a bit of color.

This spot along the 23.5 degree north parallel marks the northern boundary of the tropics.

A shining treasure trove of fine Mexican silver dating back to the 15th century.

Climb through the life of a Mexican hero as you ascend a 130-foot statue.

An incredible collection of Mesoamerican art assembled by one of Mexico's great artists.