At almost 1,000 years old, this is the oldest known door in all of Britain.

One of America's founding fathers lived in this London lodging between 1757 and 1775.

One of only five observatories in the world built to measure the Earth's wobble.

Celebrating the transformation of trash into objects of beauty.

North America's first frozen mummified remains of an ice age steppe bison, the 36,000 year-old mummy named "Blue Babe."

The sculpture's largest spire points directly toward the North Star.

Mind-blowing carvings and fantasy ice scenes grace the largest year-round ice environment in the world.

Old neon signs from the City of Brotherly Love provide a snapshot of the city’s evolution.

Alexander Hamilton’s creation caused quite a bit of controversy.

One of the indelible moments of the American Revolution took place at this location.

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

A more than 260-year-old crypt built on Boston's oldest English burial ground.

These whimsical works of art tell the story of the city's past and present.

American revolutionaries and British soldiers alike are buried here in the fourth-ever cemetery in Boston.

Historic Hull Street was actually the first street with a proper name in the Boston area.

The first bell ever cast in Boston was cast by Paul Revere...and sounded terrible.

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

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

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

Narrowest house in Boston.

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

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

A historic bridge with a lovely acoustic anomaly.

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