A precariously balanced rock perches on the edge of a cliff created tens of thousands of years ago by glacial erosion.

A model home in the Medical Examiner's Office in which grisly death scenes are staged to train forensic investigators.

Walk a trail through a historic Quaker town that outlawed slavery in 1777 and was a major waypoint on the Underground Railroad.

George Washington's dentures and Queen Victoria's dental instruments are in the nation’s official museum of the dental profession.

Fascinating museum dedicated to the under-appreciated medical history of urology features some wince-inducing devices.

Captain John Smith thought these cliffs were amazing in 1608 but sharks thought so 20 million years before him.

A cave on the Maryland border where civilians took refuge during the bloodiest battle of the Civil War.

It's not your typical library, memorial, or book store.

A charming desert roadside bakery that produces 10 times more bread daily than it has residents in its town.

The world's first permanently occupied mountain-top observatory continues to report on the stars.

A tree grown from astronaut seeds which were exposed to cosmic rays.

The largest Star Wars collection in the world is its own galaxy of collectibles.

A shining sculpture made of 3,115 lights, the number of visible stars in the Northern Hemisphere.

A miscalculation turns a very shallow freshwater lake into a very deep saltwater lake.

This sinkhole was created by a tragic industrial accident and continues to ravage the surrounding landscape.

The world's only and thus largest collection of its kind celebrates everyday wonder through simple umbrella sheaths.

The first bridge observation tower in the U.S. offers one of the best views of Maine.

This 19th century granite fortification is one of the most well preserved forts in New England.

The most photographed house in Maine looks good enough to eat.

The longest escalator in the Western Hemisphere takes over three minutes to ride down.

A blank headstone topped with a pile of pennies marks the final resting place of the infamous assassin.

Despite violent work crews and massive delays this abandoned canal tunnel was built to last into the modern day.

Walk through the history of American pop culture.

From the Difference Engine to the Cray-1, all under one roof.