One of the three perfect vellum copies of this historic book known to exist is on display in a specially-designed case.

This groundbreaking 16th-century map is known as "America's birth certificate."

The 28,000-year-old specimen is remarkably intact.

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

With over 100 jam-packed rooms to explore plus elaborate tea services and events, the Mansion on O Street is a hidden treasure.

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

A little marble compass above George Washington's (empty) tomb in the Capitol marks where D.C.'s four quadrants intersect.

"Congress may voluntarily remain in session throughout the summer, in order that our Congressmen may be protected from the intolerable discomforts and dangers of the ordinary outdoor weather!”

The only example of a Paris Métro sign in use at a subway station outside of the French capital. 

An interesting look into 18th-century American history.

Fossilized sea bottom and lime quarry.

A town wears its heart on the sleeve of a smiling girl, arms flung wide open in a cheerful greeting for all who encounter her.

According to the experts at the Guinness World's Record office, this is the longest candy counter in the world.

Rock face that shares a name with Mary Shelley's famous doctor.

A very big rock just plopped down in the New England woods.

This 150 foot seven-tiered cascading waterfall is one of the hidden gems of the White Mountains.

This cabin survived a landslide that killed its owners.

This giant monument of the RCA mascot is a beloved fixture in Albany, New York.

A monument to the military service of America's greatest traitor refuses to even name him.

True to its name, this bouncy walkway may be the world’s smallest suspension bridge.

A long-forgotten Victorian swimming hole is still a fun spot for a dip.

This narrow canyon has been carved by the river over thousands of years into spectacular and curious forms.

The small burial plot is located in a mall parking lot.

A fictional town that was briefly brought to life before fading once again out of existence.