A Circus legend leaves an unexpected endowment.

A building so large that it has its own weather.

Take a steam-powered ride straight out of the past on this Appalachian rail line.

World War II bunker still standing on the New Jersey beach.

Civil War soldiers, captains of industry, and paupers all interred on historic grounds.

This architectural triumph is the only Frank Lloyd Wright house in Alabama.

A man-made island in scenic San Francisco Bay.

This float factory takes the mask off of Mardi Gras and lets visitors see where the magic happens.

The Hudson River School comes alive at this palatial estate.

This Memphis recording studio launched the careers of Jerry Lee Lewis, Johnny Cash, and Elvis Presley.

A miniature city built by a single hunchbacked monk.

The only natural lake in the world that drains into both the Atlantic and Pacific Oceans.

At 207 feet, one of the world's longest continuous escalators.

An enormous natural sandstone bridge in Kentucky.

The only road through the heart of Glacier National Park.

The king of U.S. high points towers over every other peak on the continent.

The oldest farmer's market in America is so ancient it was approved by the King of England.

This abandoned sea fort has become an accidental bird sanctuary.

A haunting tribute to pioneering photographer Clover Adams.

I-95's Tijuana-style celebration of kitsch at the Carolina border.

This palatial botanical garden is home to one of the largest pipe organs ever installed in a private residence, and a piece of Wood's cycad.

An 18th-century Spanish watchtower made entirely of seashell and concrete.

A monument celebrating the idea of reaching inaccessible places.

All you ever needed or wanted to know about America's favorite whiskey, but not a drop to drink.