This ancient Hawaiian henge may have been an early star chart.

Race through the maze, get your name on the sign.

After a short-lived attempt to bring America in line with the rest of the world, this road was left in metric.

One of Savannah's oldest and most haunted cemeteries, featuring graves desecrated by Sherman's Union Army.

The first public building in Savannah to offer air conditioning was a luxurious cinema that still operates today.

This kitschy tavern is also home to rare early editions of "Treasure Island."

Former villa and estate of James Deering developed to preserve native tropical forests.

A propulsion engine testbed that paved the way for the Space Shuttle launch sits without recognition at this rocket center.

It may look like no more than a full-scale model, but every part of this full Space Shuttle stack had a working role in aviation history.

What else would you call a playground hidden in Alabama's oldest and largest cemetery?

An Irish Memorial commemorating those who perished due to potato blight.

A 1,100-ton train fell through the floor in 1953. Workers got it patched up in just 72 hours.

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

The oldest building in the District of Columbia was preserved because of a mistaken connection to George Washington.

The oldest continuously operating fish market in the United States.

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

The United States Capitol's former columns still stand.

One of the dwarven trees dates back to 1625 and survived the Hiroshima bombing.

Once the supplier for noteworthy projects like the National Cathedral, this old brickworks now lies abandoned.

Franciscan monks created a facsimile of the Holy Land for North Americans who couldn’t afford the trip overseas.

There’s a hidden military meme engraved on the World War II Memorial.

A monument in Washington D.C. marks the spot from which all other roads were supposed to stem.

Fittingly, America's museum of architecture is itself a magnificently designed old building.

Legend has it that President Grant’s frequent drinking in the lobby gave rise to the term “lobbyist.”