The remains of Martha, the last known passenger pigeon, serve as a tool to educate about conservation.

A traveling postal dog covered 48 states and more than 140,000 miles, and he lives on as taxidermy, patched up with a rabbit's foot and a pig's ear.

A monument in Washington D.C. marks the spot from which all other roads were supposed to stem.

Home to items never before seen by the public.

An organ located deep within a cave, whose "pipes" are the geological features of the cave itself.

One of the largest underground systems runs under Canada's largest urban center.

One of the Seven Wonders of the Modern World holds the world's tallest metal staircase.

A 400-square foot model of historic Quebec is the playing field for a state of the art light and sound show.

This lovely, if imposing, piece of Canadian gothic is possibly the most photographed hotel in the world.

This Canadian monument to the man who invented the telephone allows visitors to get up close and personal with the artifacts of his life.

Home of the world's smallest dinosaur footprints.

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

A mysterious stone embedded at the base of a historic Boston building.

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.

Mass Grave of 48 colonists killed in a raid by Native Americans and the French in 1704.

This Niagara Falls tourist trap is a world bright with neon and curiosities that will inspire love, hate, or a mixture of both.

One of many reminders of Tesla's scientific contributions overlooks the falls which inspired him.

Niagara Falls holds a special place in Nikola Tesla's history, so they put a statue on it.

This dramatic rail curve was once the target of a failed Nazi attack.

Meet your friends, marry your true love, or tell your enemies to kiss your butt under this historic Pittsburgh timepiece.

The largest clock face in the United States is twice the size of Big Ben and infinitely more ad-sponsored.

A portion of the old Pirates stadium over which a defining home run once flew still stands even after the rest of the stadium was torn down.

A dramatic, 360-degree recreation of Pickett's Charge in the Civil War.