This might just be the TARDIS of bookstores.

The universally beloved children's television figure is interred on a high hilltop in one of western Pennsylvania's oldest cemeteries.

The house that Frank Lloyd Wright "(shook) out of his sleeve at will" at the age of 86.

Huge masonic hall in Philadelphia with lavishly themed rooms.

Frank Lloyd Wright's most iconic home dangles over a Pennsylvania waterfall.

The final resting place of an unidentified revolutionary soldier sits behind a Virginia church.

The airport was once a Civil War battleground, and the earthwork defenses can still be seen today.

The tomb was guarded by soldiers from both sides of the war, and some left their initials carved in the brick.

A museum dedicated exclusively to aircraft used in the military.

An eccentric company offers eccentric millionaires the opportunity to have spaceflight-related experiences.

The graveyard holding the remains of George Washington's slaves was forgotten for nearly 200 years.

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.

America's first federal monument.

This stately building in Alexandria, Virginia was built by Freemasons to honor one of their most famous members.

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

The Virginia farm where John Wilkes Booth met his grisly end is now largely forgotten.

This war hero's old shop remembers the fine line between medicine and quackery during the Revolutionary War.

An extensive, if one-sided, history of U.S. law enforcement's war on drugs.

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

This unique historical monument features large concrete spheres designed to resemble fallen stars.

This old-fashioned carhop restaurant gave the world the waffle cone.

Lines from a walking song are etched into a rock in Natural Bridge State Park.

The oddly shaped, steam-spewing building is now an art studio and gallery.

This collection of over 50 classic pinball machines awaits visitors to downtown Roanoke.