A giant Troll lurks under one of Seattle's oldest bridges.

A walk through the historic city center, under the streets of Seattle.

An enormous pink granite batholith, long attributed with spiritual powers by the Tonkawa Indians.

The site of one of history's most indelible and horrific tragedies.

The headquarters of the Fraternitas Rosae Crucis, complete with Rosicrucian pyramids, all in the Pennsylvania woods.

A unique sculpture park that specializes in the huge and bizarre.

Arlington Cemetery exhibit dedicated to death and grieving.

Dr Barnes' $25 billion private collection of art and arboretum.

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

This museum boasts a bucket of teeth and tells the tale of a 20th-century dental circus.

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

A layered tribute to the work of mosaicist Isaiah Zagar.

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

Century-old shop, specializing in Occult products.

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

Huge masonic hall in Philadelphia with lavishly themed rooms.

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

World's first "penitentiary," meant to be humane, drove men insane.

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