This unassuming passageway played a key role in one of the most important events in U.S. history.

A three-story tower of books about Abraham Lincoln is one of the more unusual monuments to the president.

A 14-foot monument marks the resting place of two of the town's earliest residents—and one unknown soldier.

This hot dog-shaped diner has moved all around Colorado, never been to New York.

This seemingly out-of-place gas station by the Watergate hotel was once described as the most expensive gas station in the world.

Home to items never before seen by the public.

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

This general store has stood in the same spot for well over a century.

This propitious plastic porcine has been petitioning park visitors to pick up after themselves for more than 50 years.

The most historic church in Fairfax County played a role in the creation of the American Red Cross.

A museum cafe showcases Native American dishes and indigenous ingredients from across the Western Hemisphere.

The story behind this beloved toy—named for Theodore Roosevelt and owned by his grandson—is more complicated than you might guess.

One of the best-preserved medieval streets in Europe.

The former home of Dr. E.B. Henderson, also known as the "Father of Black Basketball."

The smallest covered bridge in Maryland.

This Maryland farm is known for its amazing corn mazes and its 30-foot junkbots.

Washed out by the Johnstown Flood in 1889, the surviving portion of the original two-span bridge now resides at Fishing Creek.

A surprising, but overlooked example of geology in the middle of the nation’s capital.

Finally the worlds of UFO enthusiasts and beef jerky lovers have come together in this roadside shop.

This giant temperature attraction created some giant electric bills.

Hundreds of trees made from glass bottles make up this forest on Route 66.

These markers are used to document elevation changes around the famed dam.

Experience a charming 1930's version of "infotainment."

A Norwegian-born sculptor created these soaring guardian angels at the entrance to Hoover Dam.