In this case, 'zero' marks the spot where the iconic Old Spanish Trail ends.

A monument celebrating the idea of reaching inaccessible places.

A tribute to Ponce de Leon's supposed quest for eternal youth.

A luxurious 1880s hotel with its fair share of Tiffany stained glass, Edison electricity, and of course, ghosts.

The former home of the Nobel Prize-winning American writer is now home to dozens of six-toed cats.

The saga of the massive nut begins and ends in Texas.

Turning night into day in Victorian-era Austin to thwart a serial killer.

The childhood home of the Sultan of Swat is just a line drive away from Oriole Park at Camden Yards.

Baltimore's classic clock tower was once topped by a rotating, 20-ton medicine bottle.

The design of this historic domed church was influenced by Thomas Jefferson and intended as a statement of religious freedom.

The trials and tribulations of marking Poe's grave.

The site where Poe "in great distress, and ... in need of immediate assistance" likely died.

The highest point in the state of New Hampshire, and while unlikely "the worst weather in the world," it sure seems that way to hikers.

Tour the world's largest deep-hole dimension granite quarry, where you can view the plant where gravestones are made and roll a ball down the outdoor granite bowling alley.

This four-story steel sphere in Maryland was used to test biological weapons.

This Delaware River bridge is emblazoned with a catty slogan from a more prosperous time.

The final resting place of many of New Jersey's most famous residents, including U.S. history's most in-vogue antagonist, Aaron Burr.

Nassau Hall has served as army barracks, a museum, and played a key role in the American Revolution.

The stone sculpture of an Ottoman soldier is an homage to a lost Providence landmark.

Ironically this massive termite is the mascot for a company that is acclaimed for killing his kind.

Rhode Island's tallest building bears a resemblance to the "Daily Planet" building and has been empty for more than five years.

Step back into the glory days of Florida's nascent tourism industry at this Gilded Age palace.

Electrical pylon in the shape of Disney's beloved mouse.

Macabre headstones carved with winged skulls, dancing skeletons, and pithy reminders of impending death.