The United States' oldest Episcopal church still in active use.

The stone marker that Mason and Dixon placed at the eastern end of the famous north-south border they surveyed.

The mistake that launched the commercial broiler chicken industry is immortalized in the town where it took place.

A desiccated merman and a walrus penis bone are among the oddities in this eclectic collection of shipwreck treasures.

A unique marker erected during the 18th century.

Rediscovered after a century, the father of the American Navy was reinterred in something dredged up from Davy Jones' Locker.

A total of 14 men held the title of "president" before George Washington—their historical legacies are enshrined in the lobby of a hotel.

Watch maple syrup being made without ever leaving the city.

The metal truss bridge served as the sole entry point to an "isolation island" for smallpox outbreaks throughout the 1870s and early 1940s.

Louise Bourgeois' 30-foot-tall steel spider sculpture.

Canada's subterranean Cold War museum has doubled as a movie set.

A tribute to the man who invented basketball stands in his Canadian hometown.

Canada's oldest railway tunnel is illuminated in a rainbow of color as it passes under the streets of this small city.

Located on the banks of the St. Lawrence River, this mansion is home to a massive art collection.

A museum dedicated to the history of electric interurban transit near the home of the first electric trolley system in the United States.

Board a mine car and descend the #190 slope 300 feet underground into the Clark Vein of coal.

A train station that was abandoned by the coal industry and was later converted into a cocktail bar.

Buildings that dynamite couldn't bring down were abandoned because of bathroom issues.

This eerily well-preserved coal town was saved from destruction by a Sean Connery movie.

Beautiful views of the surrounding hills and birds of prey can be found at this sanctuary.

A wonderous place devoted to art and metal.

This semi-spooky remnant of an abandoned hotel provides fantastic views.

A painfully obvious spy house sits right across the street from the Russian Embassy.

Once home to seven different roller coasters, Glen Echo has undergone many transformations since its founding in 1891.