This stately building in Alexandria, Virginia was built by Freemasons to honor one of their most famous members.

The Virginia farm where John Wilkes Booth met his grisly end is now largely forgotten.

The narrowest house in America is seven feet of pure spite.

At 207 feet, one of the world's longest continuous escalators.

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

An abandoned network of military bunkers and tunnels open for anyone willing to descend into the darkness.

One man's eclectic collection of treasures found at sea.

Stroll through a wonderland of stupendous moss-covered trees.

A wall of chewing gum moonlights as collective art.

An octet of classic chrome trailers speared into the ground act as a tribute to the silver bullets of the open road.

Clean, cold drinking water flows from a nondescript pipe in a roadside rock face.

While not recognized by Guinness, this chocolate waterfall is likely to be the world's largest.

This memorial honors thousands of enslaved Africans and their descendants who died in colonial New York.

This taxidermy scene brings the struggle for survival in the Indian jungle to a quiet corner of a Manhattan museum.

This poignant display is now a memorial to these regionally extinct species.

This impressive scene portrays the elusive forest giraffe of Central Africa.

This magnificent herd of stampeding elephants has been frozen in time for over a century.

Two large-scale sculptures of Adam and Eve greet visitors in the nude at the Time Warner Center in NYC.

Outstanding taxidermy dioramas showcase the grandeur of the continent's wildlife with spooky realism.

Imagine having a street run right through your home, or better yet, a historic bridge three stories high.

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

The last living thing to come out of the rubble after 9/11 is now a symbol of hope and resilience.

The competition: breathe deeply as long as you can.

Gang fights don't just happen on the streets, they happen under them too.