A playground inspired by differential calculus dangles from the ceiling of the Liberty Science Center.

The largest cemetery in Louisville is the final resting place of Col. Sanders and Muhammad Ali.

A fake mine that was made using real mining techniques which is also used as a community center.

One of the longest water bridges in the world was built over a supposedly haunted swamp in Louisiana.

A monument to the center of the North American continent may be off by a few miles.

A treasure trove of rare and fine fabrics from around the world.

After a short-lived attempt to bring America in line with the rest of the world, this road was left in metric.

Two community gardens under the elevated subway lines on a very busy commercial strip in Bushwick.

The highest point in Maryland is only accessible by hiking through another state.

The first bridge observation tower in the U.S. offers one of the best views of Maine.

This small city where almost everyone lives in the same building can only be reached via North America's longest tunnel.

Forget Hollywood, one of the biggest stars in the world can be found in Roanoke, Virginia.

A restaurant and lodge in northern Wisconsin which served as a clandestine hideout for John Dillinger and featured one of the most famous botched FBI raids in history.

A pride of the state, this working museum crafts pottery mosaics in the style of Pennsylvania's earliest European settlers.

This California tree is the single source of the state's entire orange industry.

This 19th century mansion façade adorned with immigrant patriotism is a symbol of Louisville’s history.

The only place to see live frogs don pigtails and top hats, then eat their scrumptious legs.

A poignant memorial to a young boy whose death spurred a dramatic increase in organ donations in Italy—dubbed the "Nicholas Effect."

Malibu's first beach home features an astonishing trove of ceramic tiles.

A stark reminder of the huge nuclear weapons plant that once stood on the site and its effect on the surrounding area.

Once home to over 8,000 exiled Hawaiians suffering from Hansen's Disease.

Historic home of America's sweetheart sharpshooter, Annie Oakley.

Over 50 historic windmills whir away at this outdoor museum.

An unusual bed & breakfast made of papercrete.