Where scientists keep miles of very valuable ice from Antarctica and Greenland from melting.

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

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

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

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

A curious building honoring past and current members of a historic musical comedy troupe.

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

A daily replay of the experiment that proved the rotation of the Earth.

The oldest university museum west of the Mississippi retains its 19th century feel.

An Iowa town celebrates its heritage with the tallest working Dutch windmill in North America.