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

A forgotten relic from New York's bygone trolley system hides in plain sight under a bridge.

This small museum gives visitors a chance to soak up the history of the "sponge capital of the world."

A pride of the state, this working museum crafts pottery mosaics in the style of Pennsylvania's earliest European settlers.

Though its celestial ceiling is impressive, the true star is the vast collection of French books.

A recently abandoned psych ward at the end of Sanatorium Road.

This charming colonial alleyway is one of the oldest continuously used residential streets in the U.S.

An oasis of calm amid the chaos of the boardwalk, the museum traces the heritage of this beloved beachside amusement park.

The oldest family-run luncheonette in New York, last renovated in 1948, still serves food and drinks the old-fashioned way.

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

The "Seinfeld" diner.

The 28-foot granite map plots the locations of 40 theaters in New York City.

A sculptural commentary on capitalism pokes up from the East River.

The final resting place of many of New Jersey's most famous residents, including U.S. history's most in-vogue antagonist, Aaron Burr.

A bit of retro transportation flair preserved in the world's largest department store.

A mysterious echo seems to defy the laws of acoustics.

Amid the bustle and noise of the Financial District hides a secluded garden oasis above the city streets.

Mysterious meeting place for UFO hunters near Area 51.

These 20-foot sculptures will help guide you from the local train station to the local sculpture garden.

The final resting place of two members of the infamous Doan gang, notorious outlaws and Revolutionary War Loyalists.

Elvis's own personal tropical hideaway.

A historic covered bridge is but one example of an oddly prevalent American urban legend.

A park full of outsider art, created by college students studying outsider art.

The internal railway of one of the biggest steel plants in America has been transformed into a linear park with unique industrial views.