Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.

The television series' iconic giant foot was borrowed from this classical painting.

Once the largest windmill outside of Holland, with enormous 114 foot sails.

The key to turning shifting dunes into the green oasis of Golden Gate Park.

Golden Gate Park's historic collection of plants.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

The seawater playground of gilded-era San Francisco burned to the ground in 1966.

Relics of the 1894 Midwinter Exposition continue to delight visitors today.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

One of the largest trees of its kind in California.

North America's largest accredited model railroad museum.

Home of mutant livestock.

This recently restored timepiece has stood all around Kansas City.

An adorably sweet display of sculpted Precious Moments figurines.

This former small town was destroyed not by the motor oil it sprayed the ground with but by the toxic waste that was added.

400 million-year old limestone caverns nestled in the Ozarks served as shelter and a hideout for cultures throughout North American history.

The Magic House provides a beautiful and creative environment for curious youngsters to get their knowledge on.

You have to love a museum with a truly dedicated focus. A focus on Superman, for example.

Fresh wooden posts have been added to ancient holes to recreate a primitive henge clock.

Once one of the world's great cities, Cahokia was a place of religious worship, trade and mass human sacrifice before being mysteriously abandoned.

When you visit his grave, be sure to rub the Great Emancipator's nose for good luck.

The multinational Burger King chain is banned from operating within 20 miles of a family restaurant filed under the same name.

The unluckiest U-boat in the entire German fleet is now on display in a Chicago museum.

An interesting decoration on this historic site, this weathervane comes with as many legends as it does questions.