The world's largest fire hydrant is supposedly tornado-proof.

This titanic steel chain linking two buildings was installed without permission but instantly beloved.

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

"X" marks the spot of an echo chamber in the middle of a plaza.

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

Local myth claims this is a Sears catalogue home with its windows installed upside-down.

A statue honoring 44 continuous years of greeting passing ships.

More than a century after her death, Little Gracie Watson remains one of Savannah's most often-visited residents.

This haunting tombstone comes complete with a heartbreaking story of love and loss.

The world-record holder for the longest bridge stretching continuously over water.

A building so large that it has its own weather.

The unique collection includes bronze cast handprints of some of America's most famous astronauts.

One of the largest artillery pieces in the world sits in a Washington D.C. parking lot.

The U.S. Navy’s preposterously detailed mini battleship took 77,000 hours to complete.

A double agent hid information for the Soviet Union beneath this bridge for more than 20 years.

At Washington's Dulles Airport is a satellite museum (no pun intended) with three quarters of a million square feet of aircraft history.

These unusual rooms on wheels are holdovers from the 1960s.

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

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

A cavernous three-story, 43,800-square-foot basement that was forgotten about for 60 years.

Before Nixon, "watergate" meant canals.

The little-known, 300-year history of the area includes former lives as a bustling tobacco port, parking lot, and industrial dump.

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

This bug-eyed water wheel uses the power of the Sun to clean up Baltimore Harbor.