Macabre astrological automaton clock dating to the late 1400s.

Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.

Scattered throughout London are ancient remnants of the city's former bounding wall.

A hands-off space for graffiti artists to hone and display their skills.

This shop and gallery is a modern-day cabinet of curiosities, unassumingly positioned along an urban thoroughfare.

The exterior of this home was used for the hit television show, The Brady Bunch.

A perilous medieval road leading right into the sea.

Gladiators battle and chariots race daily in the ruins of a once-great Roman city.

The world's oldest map of the holy land gives us a fragmented glimpse of the layout of biblical nations.

A bathhouse from the second Islamic Caliphate decorated with frescoes of constellations, pleasure gardens, and naked ladies.

A church of bones, decorated with 40,000 human skeletons.

The best place to send your postcards home from Antarctica.

Enormous statue of the Emperor of the Mongols.

A huge communist-era propaganda monument and mural that offers stunning views of the Mongolian capital.

17th century streets hidden under Edinburgh were once a breeding ground for the black death.

The deepest lake in the United States, and once the site of epic destruction that lives on in legends.

The largest stone moai on Rapa Nui.

A still functioning vaudeville carousel that has operated for over a century boasts a colorful menagerie and past.

An ancient capital city that dates back 3,000 years old and harbors many surprises.

Since 1973, this block has been home to the most concentrated collection of murals in San Francisco.

The magic's in the hole!

The key to turning shifting dunes into the green oasis of Golden Gate Park.

The haunting ruins of Jack London's dream house.

Concrete strongholds stand guard over the Golden Gate.