The castle still holds traces of the abandoned Roman fort it was built atop.

A volcanic old faithful, Stromboli has been erupting continuously for the last 2000 years.

Italian cave with exceptional acoustics and an unsavory history.

The world's most active stratovolcano is almost always erupting.

This bronze boar's snout has been rubbed to a golden sheen by visitors seeking good fortune.

The oldest operating pharmacy in the world features 800-year-old recipes.

The doodles of a genius line the walls of a secret room under the Medici Chapel, where they were hidden for nearly 500 years.

Every inch of this chapel is covered in craftsmanship from across the world.

Thousands of well-dressed mummies below a monastery.

This intriguing Bronze Age artifact spent centuries hidden within a Welsh faerie hill.

The medieval woodcut-style artwork chronicles life in medieval London.

A museum that chronicles the interesting and often dark history of the London docklands, once one of the major trading ports of the world.

These wire animal sculptures commemorate the exotic inhabitants that once called the Tower of London home.

The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

London's last remaining public soapbox site has seen speeches from Karl Marx, Vladmir Lenin, and George Orwell.

An small and easily overlooked archaeology museum chock full of Egyptian artifacts.

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.

An incarceration museum on the spot of possibly the oldest prison in England.

Rebuilt remains of a temple to Roman god Mithras.

One part local history, 99 parts gruesome haunted house.

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