The massive machine creates cracking displays of indoor lightning.

A retrofuturistic art installation in the Pittsburgh Airport.

This home is steeped in history from, George Washington to George Corwin, High Sheriff during the Salem Witch Trials.

A Harvard-area eatery preserves the uncovered tiles of its century-old predecessor.

This beautiful architectural gem was the first waste treatment facility in Boston.

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

One man’s hobby is another man’s world of metal wonders.

There must be a pun in this haystack somewhere...

Mausoleums, astronomy, and animatronic dinosaurs at this memorial to an assassinated American president.

The 25th President's marble casket can be visited in this classical Ohio tomb.

This campus museum commemorates a national tragedy.

Memorials and tributes scattered across the university grounds remember a famous national tragedy of the Nixon era.

The only U.S. Senator to die on the field of battle is buried in San Francisco but memorialized at Balls Bluff Regional Park.

Knoxville’s architectural icon was the symbol of the 1982 World’s Fair, even catching the googly eye of Bart Simpson.

One day a year it is legal to jump off of this astoundingly tall bridge that spans an Appalachian gorge.

The hill that gave the Massachusett tribe, and later the state, its name.

The nation's second-ever First Lady urged the founding fathers to "remember the ladies."

The homestead of American patriot John Adams.

The water-powered carriages are long gone, but for over a century this funicular railway has been the fastest route to the highest point in Paris.

A horde of stray cats rule in this secluded Parisian cemetery under a bridge.

France's most famous cemetery, with some of its most curious tombs.

This former “ante-chamber to the guillotine” has been refurbished to illustrate the brutal history of French justice.

The tradition of open-air secondhand and antiquarian bookselling in Paris dates back to the Renaissance.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.