The 25th President's marble casket can be visited in this classical Ohio tomb.

Major tourist destination known for its bubbling mud-pools and hot thermal springs.

Pennsylvania's own Roswell-style UFO mystery.

The quiet field that inspired one of the most famous songs of all time.

This unreal Portuguese palace looks as though it's made from a pile of different castles.

The world's only statue dedicated to the greatest Great Dane in comic strip history.

A technicolor place of worship for Elevationists.

Home to items never before seen by the public.

A sacred site for Native Americans surveyed by George Washington and owned by both King George III and Thomas Jefferson.

The 80-foot tire that looms over Michigan's I-94 was once a Ferris wheel in the New York World Fair.

Despite its name, this fast food museum is actually a replica of the ninth McDonald's store.

A series of markers along one side of an Amsterdam canal memorialize the Jewish residents from the other side who died in the Holocaust.

This statue commemorates the meeting of the most influential minds of the women’s rights movement.

This whimsical Oz-themed park had a wonderful impact on the surrounding neighborhood.

The birthplace of America's favorite fruit-flavored mystery dessert.

The alley connecting two of country music’s most historic venues has a rich history of its own.

From Tintin to the Smurfs, Europe's greatest graphic icons are celebrated in a grand Art Noveau gallery.

The first KFC is on the National Register of Historic Places.

The former home of the Nobel Prize-winning American writer is now home to dozens of six-toed cats.

Descend into the world’s longest-running deep anthracite coal mine.

The beginning of the historic Iditarod Trail connecting the Alaskan cities of Seward and Nome.

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

Running under an entire mountain, the longest highway tunnel in North America is kept fresh using portal fans and jet fans.

While not recognized by Guinness, this chocolate waterfall is likely to be the world's largest.