A mysterious chasm in the heart of the ancient Roman Forum, the Lacus Curtius was once believed to be a gateway to hell.

Go inside to really appreciate this 500-year-old technological masterpiece.

This strange bovine gargoyle is said to have been put in as a passive aggressive form of revenge.

The very center of Paris is surrounded by a bevy of strange good luck rituals.

Daily jousts and dancing barrel makers in Munich's mechanical clock.

The fairy tale castle of the "fairy-tale king."

Air Force Academy Chapel made of 100 identical tetrahedrons works to inspire those of all religions.

Strange red rock formations that have been attributed to a higher power for hundreds of years.

The small town of Poulsbo in Washington state is the next best thing to the Kingdom of Norway.

This famous bridge twisted itself into oblivion, but not for the reason you might think.

The American rainmaker and a burst dam.

One of the few remaining carousels built by master amusement park carver Charles I.D. Looff.

Hollywood's most famous landmark, the "temporary" sign that has stood for decades longer than intended.

The ghostly remains of an accidental sea.

The world's largest military aircraft cemetery.

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

This public square capitalized on a single Eagles reference to bring some life back to an Arizona town.

See massive fossils that are over 200 million years old in northeastern Arizona.

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

Natural catch-basin rocks covered in thousands of drawings spanning many millennia.

Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

A monument celebrating the idea of reaching inaccessible places.

A monument in Washington D.C. marks the spot from which all other roads were supposed to stem.

The "lovely red Vega" of the legendary record-settling pilot.