This wrecked airplane has been sitting on a black sand beach since the 1970s.

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

Medicinal spa created from the mineral-rich runoff of a geothermal power plant

The doodles of a genius line the walls of a secret room under the Medici Chapel, where they were hidden for nearly 500 years.

This private skyway is filled with art and was expanded explicitly so that Hitler could appreciate a river.

Down the road from where the Wright brothers lifted off is another flight tribute practically hidden from sight in the woods.

An 18th-century Spanish watchtower made entirely of seashell and concrete.

A tribute to Ponce de Leon's supposed quest for eternal youth.

One of the world's largest tanks mimics the experience of watching rare whale sharks, giant rays, and deep sea creatures from the ocean floor.

One of the Treasury Building's original columns now sits as a garden monument in the middle of a busy military base.

Standing for over 200 years, the abandoned home of a Revolutionary War hero and later a succession of prison superintendents.

Legend has this precariously placed rock was placed by giants. Science has another explanation.

This memorial was created by an Irish nurse who lived in New York City during 9/11.

The actual model from the original "Star Trek" series is now on display at the National Air and Space Museum.

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

Every drop of D.C. tap water flows through this old waterworks.

Literal "money laundering."

Disks are rolled out onto the south lawn to absorb the impact of Marine One's wheels like giant coffee coasters.

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.

The oldest continuously operating fish market in the United States.

The site of the climactic scene from the classic horror film is now a historic landmark.

At 207 feet, one of the world's longest continuous escalators.

The 72-foot giant escaped confinement in a large patch of mulch only to be reburied in the sandy shores of the Potomac River.