This extraordinary project brings water from the Colorado River to Southern California.

The origin of the Nixon tapes is rooted in technological incompetence as much as secrecy.

The only presidential monument to display a late POTUS's actual casket.

A dazzling display of lights and crystals.

A bronze monument to Cleveland's favorite, fastest son.

The only depiction of Abraham Lincoln holding a weapon, and the names of all 9,000 Cuyahoga veterans of the Civil War.

A jukebox headstone marks the grave of the Cleveland disc jockey credited with coining the term “rock 'n' roll."

Inside the unassuming cemetery chapel is a magnificent stained glass window and mosaics.

The heroic sled dog of the 1925 serum run is preserved in taxidermy.

Cleveland's giant "free" stamp is a nod to the Civil War, but was misinterpreted for years.

The angel of death appears to weep black tears at this grave marker.

First a root beer ad, then a golf course clubhouse, and finally a massive teapot.

This historic furnace was once used to produce cannonballs during the Civil War.

The penultimate and final resting places of British General Edward Braddock—minus a few bits and pieces.

The site of the little-known Pennsylvania battle that sparked the Seven Years' War.

The house that Frank Lloyd Wright "(shook) out of his sleeve at will" at the age of 86.

A neighborhood of houses made of poured concrete through a process invented by Thomas Edison.

A museum commemorating the Donora Smog, which killed 20 people in October 1948 and sparked national outrage over air pollution.

Each step is a mere four inches tall, said to be measured by the stride of a woman wearing a hobble skirt.

A comprehensive archive of Hallmark Holiday ornaments.

A restaurant and lodge in northern Wisconsin which served as a clandestine hideout for John Dillinger and featured one of the most famous botched FBI raids in history.

John Wayne, Ronald Reagan, and other Hollywood actors have resided in this picturesque Route 66 hotel.

Next to Salt Lake City's Assembly Hall stands a tribute to some unlikely heroes of early Mormon settlers.

Since 1999, this gelateria founded by a string instrument maker has been turning out some of Rome’s best scoops.