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

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

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

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

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

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

This elaborate towering structure was once famed for its revolutionary height.

Huge masonic hall in Philadelphia with lavishly themed rooms.

This abstract roadside poultry was saved from demolition by outraged drivers and pilots.

The world's longest known cave system.

Cryptid lake monster honored with its own monument.

This 38-drawer structure claims the superlative title, but it isn't the world's only giant filing cabinet.

A 70,000-square-foot institution dedicated to a very literal, creationist perspective on the Book of Genesis.