The only royal palace on U.S. soil has been a territorial capitol, a military headquarters, and a prison for a queen.

This industrial area was the dumping ground for massive amounts of trash, some of which washes up as tiny bits of sea glass.

Watch the newest land on the planet form before your eyes.

Earth's tallest volcano is sacred to Native Hawaiians, and home to a dozen world-class observatories.

San Gennaro, the patron saint of Naples, greets pedestrians between these narrow city streets.

The burial place of an obscure North African saint was turned into a macabre body preservation factory for the 17th-century Neapolitan elite.

An underground paleo-Christian burial site composed of the remains of several cemeteries and Basilicas.

A detailed pachyderm supports Rome's smallest Egyptian obelisk.

L.A.'s oldest operating bowling alley is a beautifully restored homage to its speakeasy days.

An historic and oft-filmed spot for musclebound iron pumpers on the Pacific coast.

These delicate buggers are some of the rarest fossils that have bubbled up from the Tar Pits.

This opulent hotel has been visited by Spider-Man, Charlie's Angels, and the Ghostbusters.

This iconic L.A. bookshop is housed in an abandoned bank—both symbolic and chic.

One of the most scenic falls in Massachusetts has a history of death and grim legend.

A Barbary Coast watering hole built into a Gold Rush shipwreck.

This concrete tangle of square pipes has stood as a proud thorn in the city's side since the '70s.

Oakland's beautiful monumental cemetery.

Thousands of crosses and markers for soldiers who lost their lives in Iraq and Afghanistan blanket a California hillside.

One of the oldest used bookstores in the U.S. has been selling antiquarian treasures since 1825.

The Boston square dedicated to the dark poet who was born nearby.

Mrs. Mallard and her brood are a beloved fixture in Boston Public Garden.

This supermarket is suspended 25 feet above an interstate highway.

The headquarters of one of the world’s longest-running humor magazines bears a noticeable resemblance to a head wearing a Prussian helmet.

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."