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.

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.

Huge masonic hall in Philadelphia with lavishly themed rooms.

Shop of curiosities with a dinosaur museum tucked in its basement.

These abandoned grain silos and tunnels are an urban exploration dream.

The only Bahá'í house of worship in North America and one of only a handful worldwide.

A science teacher's dream.

The subtle science of a master molecular gastronomist.

A century-old hotspot for jazz, frequented by everyone from Charlie Chaplin to Al Capone.

A haunting statue called "Eternal Silence" has quite the reputation among visitors with active imaginations.

An antiquated German apothecary on Chicago's North Side.

An enormous park-like oasis, full of famous Chicagoans' graves.

A Bibliophile's Dream.

A speakeasy takes on Chicago's drinking culture.

This shop for all your super spy needs hides an educational secret.

This morbid, delightful curiosity shop offers everything from animal bones to human teeth.

This whimsical Oz-themed park had a wonderful impact on the surrounding neighborhood.

This massive stained-glass masterpiece is thought to be the largest Tiffany dome in existence.

A layered tribute to the work of mosaicist Isaiah Zagar.

Mural made of 100,000 pieces of hand blown glass, and until recently, the largest glass mural in the US.

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

Inside this curiosity shop, visitors can peruse the clown collection or purchase a molar from the mouth of Bigfoot.