Cleveland's giant "free" stamp is a nod to the Civil War, but was misinterpreted for years.

This pair of eccentric Ohio castles were built by a pair of brothers who wanted to bring a bit of class to the Ohio wilderness.

Home to several unusual artifacts, including a huge painting of George Washington.

The largest earthwork effigy in the world.

The mounds at this site were reconstructed with the help of archaeologists and historians.

Paranormal experiences in this hotel's room 217 led Stephen King to write "The Shining."

A monument celebrating the idea of reaching inaccessible places.

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 rather vulgar example of the transition from Latin to the Italian vernacular.

A Nesting Doll of Churches.

The yawning maw of this pagan visage is said to bite off the hands of liars.

These red and black houses were awarded to the firefighters who saved their city from an enormous blaze.

This bleach-white graveyard overlooking the ocean is accessed through a tunnel.

On a clear day, you can see all the way to the Virgin Islands from the top of this observation tower built in the 1960s.

Every equinox this Maya pyramid puts on a spooky ancient light show.

Clap your hands at the base of the pyramid, and the song of a sacred Mayan bird will echo through the air.

No telescopes, no power, no gift shop: The Observatory of Chichen Itza, one of the world's oldest observatories, takes astronomy back to basics.

Hidden in the plaza next to a pizza shop is an amazing little oddities shop.

A collection of thousands of pieces of unique, colorful glass made in this Ohio town.

Inside this McDonald's you can dine on your Big Mac and fries next to a 2,500-year-old Roman wall.

A sculpture serving as an homage to Pope John Paul II.

Installed in an act of one-upsmanship, the annual sundial in this church is also a symbolic victory for the Gregorian calendar.

Ancient ruins hidden underneath a modern luxury hotel.