This unusually circular centenarian barn became a Route 66 icon.

Nature's biggest mammal swims in landlocked Oklahoma.

This historic folk art garden contains a nightmare tower that claims to be the world's largest concrete totem pole.

Giant works of art interspersed throughout meadows and woodlands offer a new discovery at every turn.

What was once a presidential estate is now an exotic menagerie and home to the Budweiser Clydesdales.

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

This lagomorph-obsessed Route 66 emporium is home to a giant jackrabbit that sits in a bunny graveyard.

The world's tallest doric column is this Ohio monument to a naval victory in the War of 1812.

Take a drunken tour inside the world's largest known geode.

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.

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

There is no trying to fall in love with this Star Wars fountain, you just do or do not.

This private residence was the template for one of the most beloved television homes of all time.

A collection of 20th-century automata, penny arcade games, and musical contraptions.

A huge musical instrument played by the ocean.

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

At the base of the Golden Gate Bridge, a small sign basically begs for a high-five.

A local scoured more than 1,000 acres for stone to create his masterpiece.

The world's longest known cave system.

One of the few surviving "Wigwam"-themed motels.

Labor provided by Great Depression-era programs restored these 25,000 acres in Tennessee.

Follow the steps, and this roadside artwork will teach you how to dance.

Once decrepit and slated for demolition, now one of the longest pedestrian bridges in the world.