One of the few standing Roman lighthouses and a labyrinth of tunnels are a couple of the secrets at this historic castle.

One of England's most famous churches hides a pair of little known architectural treasures.

The highway's southernmost spot is a beloved local attraction.

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

A monument celebrating the idea of reaching inaccessible places.

The island residents are known for taking their quirky sense of humor with them to the grave.

"We Seceded Where Others Failed."

One-time winter retreats of prolific inventor Thomas Edison and his friend Henry Ford.

This 1920s railway depot is now home to two unique museums complete with a miniature train ride.

The smallest post office in the United States is no bigger than a broom closet.

A mysterious castle built as a monument to lost love.

The behemoth beasts engaged in an epic battle is the second-tallest statue in the contiguous United States.

This abandoned NASA launch site is now a memorial to a trio of astronauts who were killed there.

A building so large that it has its own weather.

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

Home to the largest urban bat colony in North America, estimated at 1.5 million bats.

A spur fit for a giant sits just off Highway 281 in Texas.

A house carved into a rock in the 1940s.

A clear blue swimming hole with hidden caves, still unexplored.

A sculpture made of 10 Cadillacs as a monument to the "Golden Age" of the American automobile.

Surrounded by a hundred mile radius of billboards, Little America is a roadside attraction whose primary appeal is hospitality.

Home to a timed geyser created by complete accident.

The unusual patterns in this rock formation result from two distinct modes of weathering.

A tunnel with windows, so you don't miss out on the impressive views.