A museum dedicated to a secret military hospital hidden beneath a castle in Budapest.

Once the home of a hermetic monk, this cave now houses a small church.

Built in 1870 at the bridge that connected Buda and Pest, this spectacular incline railway was almost lost forever during World War II.

Historic medieval fortified city in southwest France.

A open air theatre built on a cliff by an eccentric British woman.

Perhaps the only prehistoric monument with its very own public bus stop.

A island reachable by a causeway at low tide is possibly one of the earliest Western European locations to be identified in text.

The most southern point you can drive to in the Western Hemisphere.

This plaza at the end of the world teems with monumental tributes to a problematic history, and laser discs.

These unassuming lighthouses have seen the first reading of the Pledge of Allegiance, the first wireless transmission, and more than one mystery.

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

This monument on Breed's Hill proves that one of the most famous battles of the Revolutionary War is misnamed.

A three-piece musical sculpture installed between the subway tracks at Kendall Station near MIT.

An alley way dedicated to graffiti and street art is a constantly changing street gallery.

The 340-year-old house that inspired the classic Nathaniel Hawthorne novel.

On a former island, this old fortification once used to protect the Boston Area and started Edgar Allan Poe in his military career.

Two thousand artifacts from around the world collected by one woman who loved to travel.

What was once a true peninsula has now been filled in, causing the water to recede and leaving many streetside "waterfronts" and landlocked "islands."

An interesting decoration on this historic site, this weathervane comes with as many legends as it does questions.

A former waterfront market is now in the center of town due to some interesting Boston engineering.

Located in Faneuil Hall, the headquarters of the Ancient and Honorable Artillery Company of Massachusetts has stood the test of time.

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

The site where Charles Dickens gave his first public reading of "A Christmas Carol" in the US.

Macabre headstones carved with winged skulls, dancing skeletons, and pithy reminders of impending death.