The intricate stonework of Machu Picchu serves as a testament to Incan engineers.

This stone complex marks the urban center of a lost civilization.

The mortal remains of an estimated 70,000 people lie in the basement of a monastery in Lima, Peru.

A hard-to-reach oasis in a desolate corner of Death Valley National Park.

California's own medieval Italian castle, authentic down to the 300-year-old iron maiden in the dungeon.

Small museum packed with artifacts recovered by the man rumored to be the real-life inspiration for Indiana Jones.

One street divides a single town that stands in two U.S. states.

Stolen goods adorn the organ at Old North Church.

A centuries-old church stands as a testament to Boston's "father of architecture."

The site of Paul Revere's historic two lantern warning.

This landmark cemetery in Boston was created more than 300 years ago.

A 300-yard long natural tunnel runs through a ridge deep in the Appalachian Mountains.

The celebrated eyesore created by starry-eyed sweethearts.

The final resting place of soldiers' loyal canine companions.

The most loyal of little dogs, or a Victorian era publicity stunt?

This iconic 1,000-year-old medieval castle is a favorite of the film industry, most notably as the location for Hogwarts in Harry Potter.

A memorial to the nearly 10,000 American soldiers laid to rest on the beaches of Normandy during WWII.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

High atop the Eiffel Tower is a small apartment built exclusively to entertain the science elite and make the rest of Paris jealous.

This statue was given to France by the United States to commemorate the centennial of the French Revolution.

The fairy tale castle of the "fairy-tale king."

Trick water gardens from 1619 featuring a 200 piece mechanical theater powered by water.

This Nazi-built amphitheater was constructed on a sacred mountain site used by various German cults.

This Dresden church was purposely rebuilt Protestant after being demolished in World War II.