Believed to be the birthplace of the United States Marine Corps.

One of Philadelphia's largest murals resides hidden under this bridge.

This forgotten building was one of the few Philadelphia-area breweries to survive Prohibition.

Huge masonic hall in Philadelphia with lavishly themed rooms.

Philadelphia boasts one of the best — and most often overlooked — traditional Japanese gardens in North America.

In which a local geological marvel becomes a quaint roadside attraction.

Rare recess caves fill this unbelievably beautiful Ohio park.

This university research project is the U.S. government's weed dealer.

Where beautiful signs live on forever.

Three courses accompanied by Christian rock.

You thought Santa Claus didn't exist, but it turns out you were wrong.

An enormous natural sandstone bridge in Kentucky.

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

Every day a troupe of pampered water fowl walk the red carpet to their favorite fountain.

This head-spinningly bizarre Depression-era art cave is wall-to-wall quartz and Jesus.

Known as the "Cross At The Crossroads," this massive metal cross is just short enough to avoid the FAA.

This university transit system is a 1970's vision of the future.

Hidden deep within New Jersey Pine Barrens is a massive graffiti wonderland.

Eccentric concrete mansion and museum designed and built by hand from the inside out.

These lush botanical gardens employ the most purrfect pest control force.

A blend of art, antiquities, and Americana fill this museum, surrounded by whimsical, enchanting gardens.

This splendid Versailles-inspired mansion has the largest French-style formal gardens in North America.

The last of Philadelphia's wood-paved streets is now a landmark of terrible engineering.

The world's third-largest crystal sphere has sat in the Penn Museum since 1927 with the exception of one outlandish theft.