Two small markers remember the Alamo's feline protectors.

The oldest family-run restaurant in the United States is a living museum of New Orleans dining history.

High in the Rockies the third largest statue in the U.S. opens her welcoming arms, and lights up the night sky.

The walls of America's oldest masonry fort famously "swallowed" cannonballs.

This strange sculpture of a menacing skull surrounded by sun rays was discovered at the foot of the Pyramid of the Sun.

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

The world-record holder for the longest bridge stretching continuously over water.

This tiny, hurricane-resistant house in Galveston is one of the city's most notable architectural oddities.

"We Seceded Where Others Failed."

255 feet of suds, scrubbers, and blow dryers.

The library houses an incredible collection of some of the world's most impressive books and manuscripts.

This historical air terminal in Houston is slowly becoming an aviation museum dedicated to the city's aeronautical history.

This spiny beast guards an artist's village while vying for the title of largest lobster in the world.

The only royal palace on U.S. soil has been a territorial capitol, a military headquarters, and a prison for a queen.

The "lost friend” is the most famous of the six moai statues that were removed from Easter Island.

The awe-inspiring ship from the golden era of cruising has an incomparable history and a reputation as one of the world’s most haunted places.

The only castle in North America to ever house European sovereigns.

A haunting tribute to pioneering photographer Clover Adams.

Largest Roman Catholic church in North America.

Island ghost town detailing Flagler's folly in building the Overseas Railroad.

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

Pop culture has helped to keep this iconic British building from being destroyed.

This lonely waterfront memorial to the men of the Titanic was erected by the "Women of America."

A grand Gothic Revival basilica with stained glass depictions of Montreal's religious history has only one soul resting in its crypt.