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

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

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

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.

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

Where America's first doomsday cult awaited the end of the world.

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

An unusual assortment of steerable wooden sleds is on display in a library in New Jersey where they were first invented.

Rising out of a clearing in New Jersey's Pine Barrens is an Aztec-inspired monument to the "Lindbergh of Mexico."