The abandoned coal loading dock is a canvas for unsanctioned art.

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

Golden and naked, the figure that was once the highest point in New York is all that remains of the second Madison Square Garden.

A tour de force of a fountain, memorializing a man who loved fountains more than anything else.

One of the oldest of its kind.

The first American axe throwing club.

Erected in 1697 this Philadelphia bridge is the oldest surviving roadway bridge and perhaps the oldest stone bridge in the United States.

Current docking place of the SS United States, the fastest transatlantic ocean liner.

This little-known Revolutionary War fort is supposedly haunted by the ghosts of its past.

This meticulously extracted nervous system allegedly came from a 19th-century custodian who donated her body to science.

A museum dedicated to the strange and extravagant costumes and memorabilia of the mummers, a tradition older than Philadelphia itself.

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

The origin of this mechanical boy was a mystery until he revealed his maker by writing it in perfect cursive.

This little-known collection holds everything from "Dracula" notes, to the manuscript of "Ulysses," to the forged works of Shakespeare.

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

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

One of the world's premier laboratories for hydraulic engineering research takes full advantage of the water's power.

This 1960s kinetic artwork has been restored and is once again whirling away in downtown Minneapolis.

A Perpetually Under construction Park.

The only arched bridge made of stone on the entire Mississippi River.

Hub of Scandinavian culture in a Minneapolis deli.

Enter the Forest of the Elves.

A whimsical sensor instrument for Minneapolitans to play on their walks to work.

An architecturally-focused antique shop.