The graveyard holding the remains of George Washington's slaves was forgotten for nearly 200 years.

The final resting place of an unidentified revolutionary soldier sits behind a Virginia church.

Niagara Falls holds a special place in Nikola Tesla's history, so they put a statue on it.

Soaring over the Niagara Whirlpool since 1916.

These dramatic cola-colored falls have appeared in a poem by Henry Wadsworth Longfellow and a song by Sufjan Stevens.

This lighthouse and shipwreck museum keep a torch burning for the memory of the SS Edmund Fitzgerald.

Island where motor vehicles are banned -- home to the only carless highway in the United States.

This shallow cave got its name from copious amount of human bones found inside.

Legs Inn provides Polish food, a cornucopia of Odawa artwork, wood carvings, and mounted deer heads.

On the Hudson resides one of the largest clocks in the world.

This cemetery has graves dating back to the 17th century, including the city's oldest carved tombstone and an ominous cryptogram.

Pulled from the rubble of one of the worst modern tragedies, a steel crossbeam became a symbol of hope for New Yorkers.

A remnant of the original World Trade Center complex continues to serve as a commuter gateway.

These tourist trap caverns are said to be the former home of a legendary Pennsylvania Hermit.

Originally built to monitor fishing, this Victorian tower now educates visitors about the local salmon industry.

This is the largest cemetery in Ireland and the first cemetery museum in the world.

One of Ireland's most infamous prisons for rebels including men, women and children.

This 18th-century fort surrounded by a moat was used to store gun powder and ammunition, and now sits in the middle of a large park in Dublin.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

The comedy and tragedy of Oscar Wilde is preserved in a Dublin park, captured in a sculpture of colorful stone.

Dublin's most modern, visually spectacular bridge is modeled after Ireland's national emblem.

These powerful, if squat, Canadian waterfalls flow in different directions depending on the time of day.

An organ located deep within a cave, whose "pipes" are the geological features of the cave itself.

The last funhouse of its kind, where guests enter through the mouth of an 80-year-old blue whale.