A gift from Scotland to the United States in memory of the 270 lives lost when Pan Am Flight 103 exploded over Lockerbie due to a terrorist bombing.

In what is rumored to be an intentional act of spite, this memorial almost completely obscures the nearby grave of a senior officer.

Eat the ultimate iteration of Portugal's most beloved pastry.

Portugal's National Pantheon has a history of curses, collapses and financial problems.

Elaborately carved to showcase the glorious wealth that the age of exploration brought to the Portuguese empire.

This Industrial Age architectural and engineering gem helps visitors and residents alike traverse Lisbon, “The City of Seven Hills.”

A king's pet, a pope's gift, an artist's inspiration, and a tragic shipwreck.

The last remaining location of a drive-up hot dog stand named after a local pool shark.

South Carolina's last remaining slavery auction house is now a museum devoted to its own tragic history.

The romance of early commercial flight still fills this Art Deco destination.

At Washington's Dulles Airport is a satellite museum (no pun intended) with three quarters of a million square feet of aircraft history.

A former major munitions plant that has been converted into a sprawling art space.

Soldiers were buried next to Lee's house in the center of Arlington Cemetery to dissuade the general from reclaiming his property after the war.

This colonial tavern played host to George Washington, Thomas Jefferson, and other famous early Americans.

The longest escalator in the Western Hemisphere takes over three minutes to ride down.

At 207 feet, one of the world's longest continuous escalators.

The narrowest house in America is seven feet of pure spite.

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

Charleston's historic city jail once held everyone from pirates to Civil War POWs.

This roadside attraction has been serving out its fair share of hearty folklore and chaos since 1858.

Elevated freight railway turned wildly successful urban park.

Dedicated to one of the darkest moments in Irish history.

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

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