A wealth of seafaring history displayed on the California coast.

A historic observatory precariously perched at the "Top of Europe."

This handsomely carved wooden church is more than 800 years old.

A thin pane of glass keeps visitors from sliding off this futuristic skywalk.

This ancient Roman town was revered for the healing waters of its sacred spring.

The colonial home of Paul Revere during the American Revolution.

Interactive museum complete with costumed re-enactors and the only known surviving chest from the Boston Tea Party.

In 1958, an MIT fraternity pledge laid down on this bridge and instituted a new, unique unit of measurement.

Millions of numbers carved in glass represent the tattoos forced upon victims.

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

The bears may be gone, but their old cages can still be found.

The history of the tea trade is told in bas-relief on this historic pair of Boston doors.

Berthed at the Charlestown Navy Yard in Boston, "Old Ironsides" is the oldest commissioned warship still afloat.

Radical Bookstore and Community Space.

The American Revolution was galvanized into serious action due to the tragic clash with British soldiers that occurred at this location.

A beautiful Victorian-era cemetery, complete with a miniature village.

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

Drink a Guinness under the wings of Reagan's retired Air Force One in his presidential library.

The White House Situation Room was taken apart in 2006 and shipped to the Ronald Reagan Presidential Library.

One of the last surviving buildings of a once large and thriving Chinatown.

Happy harbor seals frolic and snooze on this warm, sandy stretch of coast.

These enormous, stern-faced statues greet visitors with lanterns, and sometimes costumes.

Resting place of Hollywood's immortals is also site of summer film screenings.

This museum is a music lover's introduction to the iconic venue.