This dilapidated castle-like structure overlooks the Hudson River at one of its widest points and was once home to nuns.

This once-grand marvel of engineering is now 41 miles of scenic hiking trail.

The home of one of America's most wealthy industrialists is now a historic site that remembers a more decadent time in the country's history.

Oldest existing church in New York and the inspiration for Washington Irving's "The Legend of Sleepy Hollow."

Half-sized replica of the Leaning Tower of Pisa built to honor Galileo.

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

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

An extraordinarily ornate museum in San Diego holds wondrous anthropological treasures.

North America's largest accredited model railroad museum.

San Diego's most historic and haunted home.

A sculpture of the famous photograph stands on San Diego's "Greatest Generation Walk."

One of the few remaining carousels built by master amusement park carver Charles I.D. Looff.

This futuristic bridge is one of the longest self-anchored pedestrian bridges in the world.

Behind this beachfront shop lies a spectacular, colorful sea cave with an equally colorful past.

This Pringle-shaped ledge makes for the perfect photo op.

This dark, quiet forest on the outskirts of San Diego is dense with rumor and lore.

Stripes of flowers bloom each spring in a 50 acre rainbow of color.

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

This public square capitalized on a single Eagles reference to bring some life back to an Arizona town.

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

What is the Thing?

An immersive environment that is part haunted house, part choose-your-own-adventure, and part jungle gym.

A Biblically-based Natural History Museum.

An homage to everyone's favorite prehistoric cartoon family.