The oldest building in the District of Columbia was preserved because of a mistaken connection to George Washington.

A fascinating and enormous collection of natural history exhibits stained by a dark colonial legacy.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

A huge musical instrument played by the ocean.

The unusual patterns in this rock formation result from two distinct modes of weathering.

This sinkhole in the Arizona desert is filled with carbonated, arsenic-rich water

A memorial to the firefighters who died in an industrial disaster is housed in a small public park.

One of the most extensive and well-preserved collections of dinosaur footprints in North America.

This immigrant bridge once spanned the Thames but is now a fixture of an Arizona city.

Don't blink or you'll miss it.

Dramatic river bend surrounds a natural red-rocked pedestal.

Most-visited and most-photographed slot canyon in the American Southwest.

The world's largest bicycle shelter can hold more than 12,500 two-wheelers.

Atop this former dutch railway office sits an interstellar work of art.

'The Letters of Utrecht' lays out a ribbon of poetry one letter at a time, with no final verse in sight.

Standing in a state of "arrested decay," this ghost town allows for a detailed peek into Gold Rush life in an unusually harsh climate.

These lamps were created to expel sewer gases after an event known as The Great Stink.

A rather grand, but tiny, folly on the banks of the River Wear associated with a Polish count.

An unusual stone chair can be found on the banks of the River Wear, not far from Durham Cathedral.

Hundreds of years ago, this lion-shaped door knocker could help a person accused of a crime find temporary safe haven in Durham Cathedral.

A monument with a strange legend involving a horse's tongue.

This library dates back to the late 17th century and was one of the first public lending libraries in England.

The 2,000-year-old pieces of metal are an ancient soldier's military discharge papers.