A 30-year-old Sycamore tree grown from a seed taken to the moon and back.

Once adorning a New York skyscraper, these reclaimed ruins now haunt an Indiana park.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

A beautiful geyser under environmental threat.

Some 2,000 carvings show this rare desert spring has been an oasis for travelers for over a thousand years.

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

No telescopes, no power, no gift shop: The Observatory of Chichen Itza, one of the world's oldest observatories, takes astronomy back to basics.

After a water tower painting was accused of being an ad, a simple fix was made that gave the city a motto.

A collection of outdoor art by renowned muralist Robert Dafford depicts the history of a flooded city.

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

The grave of the iconic Kentucky Fried Chicken mascot features a bust of the man behind the goatee.

This modern castle sat empty for decades before a fire inspired its builders to complete its luxury halls.

The whimsical construction on the roof has given rise to many a Montgomery myth about its contents.

A cemetery for only coon hounds in northwest Alabama.

A sinuous monument to the first person who was struck by a meteorite.

The country music legend's grave is surrounded by Astroturf because fans kept plucking out the grass.

A 56-foot tall statue of the god of fire looks out over Birmingham, Alabama.

Designed by Maya Lin, the memorial honors 41 individuals who died fighting for equal rights between 1954 and 1968.

Famous for its bio-luminescent inhabitants, known as "dismalites."

This midcentury LA bar was the birthplace of tiki culture.

The blinking light atop the iconic landmark has been sending secret messages for decades.

One of the most elaborate displays of Jellyfish is on display at the aquarium.