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

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

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

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

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

This beloved marketplace mascot poops money and grants good luck.

Ant sculptures march up the side of what used to be an iconic spot in punk rock lore.

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

Tour the dark and beloved poet's former cobwebbed basement, which may have inspired "The Black Cat."

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

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

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

This famous city eluded concrete detection until the early 2000's.

The ancient latrines of the Greeks, in all their public glory.

Outside the Missouri Quilt Museum, this large spool has more than one million yards of thread—and counting.

A remarkably opulent mansion with a tragic history.

The world's largest man-made underground caverns offer unparalleled underwater wonders.

Once an ambitious nature spa, these forest ruins now provide a serene monument to failure.

European castle ruins in an American state park are actually the product of death and grief.

A private home collection of more than 3,500 cat figurines.

This lakefront cottage was crafted in the 1800s and was once a sanitorium.

One extremely determined man's homemade universe.

A town filled with hot chocolate, dazzling lights, and lots of Christmas cheer.

Whimsical sculptures dot a woodland path surrounding their creator's old summer cottage.