A centuries-old church stands as a testament to Boston's "father of architecture."

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

The oldest working bell set in North America, the bells at Old North Church sat silent for their first four years in Massachusetts.

Narrowest house in Boston.

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

The site of one of the strangest disasters in history—a wave of deadly molasses traveling at 35 mph.

Visit the monolithic tomb of America's most famous general.

America's greatest forgotten garden and the former stomping grounds of Son of Sam.

What was meant to be a temporary exhibit is now a permanent fixture at the St. Louis Zoo filled with beautiful birds.

Speak to a companion on the other side of the room loud and clear through this architectural anomaly.

A drawbridge named for a potentially intersex Polish national who fought alongside George Washington during the American Revolution, and an example of "Pulaski Red".

Final resting place of the immigrant who brought artificial seltzer water to America.

This seemingly unremarkable boulder is said to bear the hoofprint of the devil himself.

A way to take your secrets to someone else's grave.

A Victorian cemetery in the heart of Brooklyn remains a popular mecca of morbid curiosity.

One of only two remaining Victorian-era greenhouses in New York.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

A beautiful geyser under environmental threat.

The first declared National Monument in the United States.

The marker offers a rare chance to be in four U.S. states at once, though there's some controversy over its geographic accuracy.

Come for the speed, leave in love with the desert.

This Memphis recording studio launched the careers of Jerry Lee Lewis, Johnny Cash, and Elvis Presley.

This funicular railway rumbles along for a mile up the nearly vertical face of Chattanooga’s Lookout Mountain.

The hotel where Martin Luther King Jr. was shot is now a museum dedicated to his work.