An abandoned stretch of highway, deteriorating next to the operational one.

This eccentric mansion museum holds a impressive collection of rare and automatic instruments.

The world's oldest hologram gallery and the labyrinthine laser laboratory of a holography pioneer.

Amid skyscrapers and traffic exists this unique aquatic ecosystem.

Rummage through this sunken ship, but leave your scuba gear at home.

The largest university building in the West is a gothic masterpiece containing dozens of theme rooms based on different countries.

A modern mechanical planetary system, part of a 10,000 year clock.

A huge musical instrument played by the ocean.

Dr Barnes' $25 billion private collection of art and arboretum.

The taxidermied remains of Charles Dickens' pet raven, which helped inspire one of Edgar Allan Poe's most famous poems.

Huge masonic hall in Philadelphia with lavishly themed rooms.

The sounds of the world's largest fully functioning pipe organ dazzle shoppers at a Philadelphia Macy's.

This beloved marketplace mascot poops money and grants good luck.

The first American department store, and home to the largest operating musical instrument in the world.

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

A layered tribute to the work of mosaicist Isaiah Zagar.

Mural made of 100,000 pieces of hand blown glass, and until recently, the largest glass mural in the US.

A clone-tree in Washington Square Park sprung from seeds that went to the Moon and back.

In the early 1800s, surgery was also a show.

100 massive sculptures in the Hudson River Valley.

The headquarters of the Fraternitas Rosae Crucis, complete with Rosicrucian pyramids, all in the Pennsylvania woods.

Mysterious rocks that ring musically when struck.

Final resting place of two dozen New York City harbor ships.

A bronze monument to the infamous radio broadcast in the real New Jersey town where the fictional Martians crash-landed.