A replica of where the Last Supper was held.

Conjoined twins Daisy and Violet Hilton were stars of the vaudeville circuit.

This nine-story building can be played like an instrument.

Colorful murals stationed throughout Charlotte bring poetry to everyone.

This memorial commemorating fallen Swiss Guards of the French Revolution has been called the saddest stone in the world.

After a profound show of devotion for his master, a dog becomes the symbol of loyalty for an entire nation.

No one is exactly sure why over a hundred lakes have formed amongst the tallest sand dunes on Earth.

These layered sandstone mountains in China look like they are made of pressed crayons.

One man's extraordinary topiary garden in a small South Carolina town.

For two weeks every June, fireflies in the Smoky Mountains perform an astonishing light show.

This large cave is a summer home to thousands of bats and has a rich history dating back to prehistoric times.

A bronze sculpture honors the 12 black students who attended the first integrated public high school in the segregated South.

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

The mysterious wonder of an underground waterfall is illuminated by multicolored lights.

A reclusive Memphis neighborhood is home to decades worth of misunderstood Masonic folk art.

The hotel where Martin Luther King Jr. was shot is now a museum dedicated to his work.

The grave of America's 11th president is not in some grand monument but instead it's hidden away on the grounds of the Tennessee Capital.

This historic museum is home to a rare Confederate Chester Gun.